Physics Brawl Problems and Solutions
An online team competition run by FYKOS from 2012, at its peak drawing 1,574 teams from 81 countries. Teams of five had three hours, starting with seven problems and unlocking more as they solved. The organisers ended it in 2025, citing the use of AI.
All Mechanics Electromagnetism Thermodynamics Waves & Optics Modern & Quantum Relativity Astrophysics
Cards List
Kinematics Dynamics Rigid body Fluids Gravitation Statics Electrostatics Circuits Magnetostatics Induction Em waves Heat transfer Gas laws Entropy Kinetic theory Phase transitions Statistical mechanics Oscillations Wave propagation Sound Interference Diffraction Geometrical optics Polarization Atomic Nuclear Quantum mechanics Stellar Orbital mechanics Cosmology Observational
1 Mowing not published 2 Different period not published 3 Playing with gas not published 4 Fast serve not published 5 Old power supply not published 6 Firmly connected mathematical pendulums not published 7 Icy cold LED lights not published 8 Lost gas not published 9 Brokenly charged not published 10 Creative DnD Hero not published 11 Staircases in Atomium not published 12 The strength of LED strips not published 13 Skipping pizza not published 14 Voltage on the voltmeter not published 15 Radar operator problems not published 16 Spinning electrons not published 17 Overturned outhouse not published 18 Potassium cube not published 19 Thermodynamical pulleys not published 20 Wired wheel not published 21 Particles not published 22 Modified solar system not published 23 Harmonical friction not published 24 Tense oscillations not published 25 Bizzare yo-yo adventure not published 26 Falling square not published 27 Ion thrust engine not published 28 Action scene with motorbike and truck not published 29 Water turn not published 30 Chasing the Sun not published 31 Gas flow not published 32 Warming up by work not published 33 Lever–pulleys not published 34 A straw not published 35 Waging a war with windmills not published 36 Conducting corner not published 37 Ftl not published 38 Speed of a shadow not published 39 Heavenly bowling not published 40 Leaking liquids not published 41 The cosmos getting far, far away not published 42 Underwater light not published 43 Hmm, where did i put that? not published 44 Racing against the rain not published 45 Blowing up a balloon reloaded not published 46 A spring and a magnet not published 47 Underwater light reloaded not published 48 Thermodynamic lottery not published 49 Giant metronome not published 50 Charged hoop in a sphere not published 51 Easterly not published 52 Thermal neutrons not published 53 Attractive Petr not published 54 The fullest spoon not published 55 Faraday’s collector not published 56 Escape across a frozen dam not published 57 B.1: Mighty power bank in action not published 58 B.2: Heavy charging not published 59 B.3: I don’t have the capacity for that not published 60 B.4: (in)efficient powerbank not published 61 P.1: Knocking the opposing boule away not published 62 P.2: Slowing our ball down not published 63 P.3: Scattered balls not published 64 P.4: Scattered balls reloaded not published 65 R.1: Telescope illumination not published 66 R.2: Shining on a teaspoon not published 67 R.3: Reflector off the focal point not published 68 R.4: Spotlight at full power not published
1 Fair sprint not published 2 Rail problem not published 3 In the shadows not published 4 Run as fast as you can not published 5 Water resource engineering not published 6 Cooking up acid not published 7 Planespotting not published 8 Formula car on the ceiling not published 9 Warming up a baking tray with pendulum not published 10 Diproton bids farewell not published 11 Accelerated deceleration not published 12 A cracked bottle not published 13 Big guitar bang not published 14 Road on road not published 15 Pulleys with blocks and friction not published 16 Increasing the degree of polarization not published 17 Warmer background not published 18 Combined not published 19 Laser lunch not published 20 Garage doors not published 21 Who would fear a buoy not published 22 Rolling glass of ice not published 23 Delicious fuel not published 24 Infinite resistance not published 25 Live broadcast not published 26 Periodic deflection not published 27 Use crosswalks not published 28 Shot at a better future not published 29 Hanging phone not published 30 Concentric spheres not published 31 Measured gas not published 32 Weather watching not published 33 Overpriced taxicab not published 34 Pressurized bubble in oil not published 35 Dramatic escape not published 36 Endless resistance ii not published 37 Dipole on a spring not published 38 Not-so-warm water not published 39 Hourglass not published 40 Rectified efficiency not published 41 All the same not published 42 Suspended not published 43 Border hill with a lookout tower not published 44 Loose ring not published 45 Double detection not published 46 Back to the U-tube not published 47 Acceleration of an idealized car not published 48 Fishing not published 49 The oppressed air not published 50 Optimally excited quantum oscillator not published 51 X.1: Floating solar sail not published 52 X.2: Solar sail on the way to the stars not published 53 X.3: Solar sail on the way to the stars ii not published 54 X.4: Solar sail on the way to Mars not published 55 H.1: Air under water – simplified to the maximum not published 56 H.2: Air under water – very simplified not published 57 H.3: Air under water – less simplified not published 58 H.4: Air under water – still simplified not published 59 M.1: First ride through Blanka not published 60 M.2: Riding through Blanka... Maybe... not published 61 M.3: Changing speeds in Blanka not published 62 M.4: Riding through Blanka... Pirate style not published
1 Rotating a force not published 2 Five-second rule not published 3 Game of tag not published 4 Changing the transmission lines not published 5 Swimming problem not published 6 Slide not published 7 Jarda’s problems not published 8 Irresistibly attractive not published 9 Flying droplets not published 10 Stealing with a spring not published 11 Radiocarbon dating not published 12 Curious cyclist not published 13 Carrying a box not published 14 Divider No.1 not published 15 Steel sphere floats not published 16 Modified solar system not published 17 Pulleys with elastic rope not published 18 Falling clothes horse not published 19 Acoustic speedometer not published 20 The Synchrotron in Grenoble not published 21 Maximal pétanque not published 22 Taxidermy of a cylinder not published 23 Rats on rats not published 24 Postmodern art not published 25 Ice in a cube not published 26 When will I be there? not published 27 Insidious horn not published 28 Incorrect voltage not published 29 Banded archerfish not published 30 Digging up not published 31 Echoooooooooooo not published 32 Maximal activity I not published 33 Immersing not published 34 Frog on a water lily not published 35 Relativistic star not published 36 Billiard not published 37 Impedance spectroscopy not published 38 Small hole in the water balloon not published 39 Changing of our star not published 40 Top of the class not published 41 Pressure difference not published 42 Fireworks not published 43 Electron collision not published 44 We want to breathe on Everest not published 45 A lake on a mirror reloaded not published 46 Coin funnel not published 47 A point jumps over a cuboid not published 48 Oscillating lens not published 49 Epic fail not published 50 Intermittent voltage not published 51 Van Allenovi is just bright not published 52 Flying mud not published 53 Maximal activity ii not published 54 Mišo is shooting not published 55 Red Wednesday not published 56 Pumping water using water not published 57 A beer problem not published 58 K.1: The pendulum swings back. . . not published 59 K.2: . . . And forth. . . not published 60 K.3: . . . And back. . . not published 61 K.4: . . . And forth, over and over again not published 62 T.1: Inflating a balloon not published 63 T.2: We are cooling down the balloon not published 64 T.3: Our balloon has flown away not published 65 T.4: Connecting balloons not published 66 M.1: Tram not published 67 M.2: The tram reloaded not published 68 M.3: Parallel tracks not published 69 M.4: Turboflies’ troubles not published
1 My hand is slipping off not published 2 Comparison of slings not published 3 Mountain biking not published 4 Hunter, shoot yourself not published 5 Falling icicles not published 6 Worn tire not published 7 Drop Da Bomb not published 8 Moving bridge not published 9 Two rectangular cuboids on a hill not published 10 Energy-saving electric kettle not published 11 Induced voltage reloaded not published 12 Archimedeskugeln not published 13 Neglecting the Earth’s movement not published 14 Hot light bulb not published 15 Bead with spring not published 16 Ballad of a sinful soul not published 17 Is that what you meant, Mr. Planck? not published 18 Red-hot resistance wire not published 19 Golf on the hill not published 20 Rubberband around the corner not published 21 Level sensor not published 22 Mountain biking reloaded not published 23 A pit with pulleys not published 24 Effective trapezoid not published 25 Race against time not published 26 Escape across the frozen lake not published 27 Heating the helium not published 28 Tropical climate not published 29 The Pit and the Pendulum not published 30 Magneto-resistor not published 31 Wheel against the direction of travel not published 32 Too high frequency not published 33 Attention, the window is falling not published 34 Blocks on top of each other on a plane not published 35 Long power line not published 36 A ball for Jáchym not published 37 Polarization as far as it goes not published 38 Dog walking not published 39 Ordinary estimate of mean air height not published 40 Modern art not published 41 Maze of resistance not published 42 Screen resolution not published 43 Wired not published 44 Electromagnet not published 45 Ladder not published 46 Mushroom hunting not published 47 A ball for Jáchym reloaded not published 48 Up and down not published 49 Revenge for the machines not published 50 Water in a bowl not published 51 Where to hide? not published 52 Reading against the light not published 53 Rattlesnake 11 not published 54 Spring with friction not published 55 Central spring not published 56 Foggy glass not published 57 Matěj’s black warm box not published 58 M.1: Fast and even faster for the first time not published 59 M.2: Fast and even faster for the second time not published 60 M.3: Fast and even faster for the third time not published 61 M.4: Fast and even faster for the fourth time not published 62 E.1: Light circle not published 63 E.2: Planparallel lens not published 64 E.3: Two magnifiers not published 65 E.4: Recording ants not published 66 X.1: We are cleaning up the garden not published 67 X.2: Watering the garden not published 68 X.3: Winding the cable not published 69 X.4: Swinging cucumber not published
1 An unfortunate trolleybus not published 2 Our antique clock not published 3 Flywheel not published 4 Roofing not published 5 Spring in an airplane not published 6 Focusing light not published 7 Induced voltage not published 8 A constant atmosphere not published 9 Molar mumble not published 10 Don’t lean out of the windows not published 11 A healthy mind in a healthy body not published 12 Insidiously smoky not published 13 An electron source not published 14 Is it cold outside? not published 15 Battering ram not published 16 Night-time thermodynamics lesson not published 17 Moving pulleys on a wagon not published 18 Beware of the fountain not published 19 Beryllgläser not published 20 Filling the bathtub not published 21 Lipno and relativity not published 22 The intersections of Lissajous curves not published 23 Conductor in a hurry not published 24 Height does not matter not published 25 The hollow Earth has many variants not published 26 An oscillating pulley not published 27 One increased, the other increased too not published 28 Doppler on his way home not published 29 Psoon not published 30 On a beach not published 31 An oscillating hoop reloaded not published 32 Finite circuit not published 33 An inclined roof not published 34 Ommatidium not published 35 Thermodynamic cannon not published 36 Center of gravity of a snail not published 37 Very thirsty not published 38 Rotary capacitor not published 39 Inevitable fall not published 40 Life is short not published 41 Radiant not published 42 Anti-reflective glasses not published 43 Dano is flying to an exoplanet not published 44 Platform 9 and 3/4 not published 45 A ride on the exponential not published 46 Carousel ride not published 47 Catapult not published 48 Too many cubes not published 49 We work by pulling not published 50 Snowball to a window not published 51 A bottle on a swing not published 52 Washbasin not published 53 Bottle on a swing reloaded not published 54 Minimisation of acceleration not published 55 M.1: The boat not published 56 M.2: The boat reloaded not published 57 M.3: The boat revolutions not published 58 M.4: The boat resurrections not published 59 E.1: Discharging a capacitor not published 60 E.2: Conductive chewing gum not published 61 E.3: Cheap voltmeter not published 62 E.4: Coil on a base not published 63 X.1: I’ll pull her down with me not published 64 X.2: To the bottom of the dam not published 65 X.3: An unknown ball in an unknown fluid not published 66 X.4: Attractive not published
1 (hopefully just) easy pulleys not published 2 Two circuits not published 3 Felling trees not published 4 The nearest asteroid not published 5 Unstable not published 6 Safe power not published 7 The ink-blooded prince not published 8 Slowed down train not published 9 We pump oil not published 10 Homogeneous air not published 11 Our old clock not published 12 Cough cough not published 13 Uneven illumination not published 14 Autumn in a train not published 15 The power of a waterfall not published 16 Burning coal not published 17 Heat and phases not published 18 Boiling not published 19 Internal resistance not published 20 Raft voyage not published 21 Mysterious ball not published 22 Illuminated not published 23 A ball not published 24 A traveler’s problem not published 25 A different parallel-plate capacitor not published 26 Oscillating hoop not published 27 Oscillating not published 28 Lego and dice 1.0 not published 29 Lego and dice 2.0 not published 30 Impact accelerator not published 31 Jump on! not published 32 Disgusting piston not published 33 4D scouring pad not published 34 Levitation by firearm not published 35 Burning phosphorus not published 36 Mixed current not published 37 Stopping a train not published 38 Solar cube not published 39 Optimal direction not published 40 Watch out, Danka is throwing not published 41 Laser at a dormitory not published 42 Pyramid not published 43 Pole dance not published 44 A fall into the unknown not published 45 Spring of knowledge not published 46 An incredible space battle not published 47 Rotational pump not published 48 Ideal centrifuge not published 49 Falling impulse not published 50 A problem with potential not published 51 Another problem with potential not published 52 M.1: At the train station not published 53 M.2: At the airport not published 54 M.3: Under the ground not published 55 M.4: In the shopping mall not published 56 E.1: Statistical 1 - intro not published 57 E.2: Statistical 2 - basics not published 58 E.3: Statistical 3 - the quantum way not published 59 E.4: Statistical 4 - the second quantum one not published 60 X.1: The strongman and the weight not published 61 X.2: (not) breathing not published 62 X.3: The pressure of a ballerina not published 63 X.4: Saliva not published
1 Inconspicuous escalator not published 2 Long day not published 3 Pair of pipes not published 4 Lost heat not published 5 One hundred not published 6 Archer not published 7 Strange eclipse not published 8 Neglect causality not published 9 Fun with RLC not published 10 An unfair race not published 11 Humber Bridge not published 12 Jumping not published 13 Spider-spider not published 14 Is it colonizable? not published 15 Dan’s fléche burnt. not published 16 One hundred reloaded not published 17 Lazy electron not published 18 Charge in a box not published 19 Helix not published 20 Charge inside a cylinder not published 21 African Sun not published 22 Red hot nickel... Cable? not published 23 Hanging here not published 24 Doggy not published 25 Ethanol emissions not published 26 Jump into the unknown not published 27 Rolling cone not published 28 Pulleys not published 29 Small torque not published 30 Asteroid with impact parameter not published 31 Defective spherical mirror not published 32 Quantum Kepler not published 33 Tense tree not published 34 Slim line not published 35 Overheated flywheel not published 36 Looping not published 37 Bumps on the road not published 38 Speed merchant not published 39 Slowly thrown rock not published 40 Aesthetic balls not published 41 Disgusting resistive skyscraper not published 42 Manoeuvre not published 43 Capacitor grid not published 44 The fourth velocity not published 45 Inside a spherical mirror not published 46 Rotary tree not published 47 Neutron rack not published 48 Sunbathing session not published 49 Diabolical spring not published 50 The charge and the pentagram not published 51 M.1: Rick’s microplanet not published 52 M.2: Interdimensional density not published 53 M.3: Squanchy frisbee not published 54 M.4: Wubba lubba dub dub not published 55 E.1: Breakers not published 56 E.2: Fykonacci not published 57 E.3: Triangular ladder not published 58 E.4: Nonlinear FYKOS-bird not published 59 X.1: Chernobyl not published 60 X.2: Hold my graphite not published 61 X.3: Not great, not terrible not published 62 X.4: Radio-activity not published
1 Underground not published 2 Passing trains not published 3 Let’s play a game not published 4 Keep pulling or I’ll whip you! not published 5 Theophist temperature not published 6 Stairs not published 7 Hockey-football problem not published 8 Resistive block not published 9 Queen’s justice not published 10 Scuba diver not published 11 Fifty not published 12 Watch out for the turn! not published 13 Planck linear density not published 14 Drop velocity not published 15 Giga-cave not published 16 Compound bow or semiautomatic pistol? not published 17 Twice as stiff spring not published 18 A warm-up hurricane not published 19 Rain not published 20 Throwing balls not published 21 Shadow not published 22 Elevator acceleration not published 23 Kevin the Cube not published 24 Chained not published 25 Cork problem not published 26 Olive one not published 27 Paťo is doing sports not published 28 Energetic pendulum not published 29 Einstein with Cherenkov not published 30 Two-state problem not published 31 Spacey not published 32 One-third train not published 33 Marble on a spiral not published 34 Olive two not published 35 Dan’s eggs not published 36 A motivational capacitor not published 37 A calm place not published 38 Finally a complex infinite circuit not published 39 Vertical shelf not published 40 Olive three not published 41 Elastic loop not published 42 Astronaut training not published 43 Exotic field not published 44 Identifying a rod not published 45 Doublets not published 46 Stellar sail not published 47 Throw over a cylinder not published 48 Evil spring not published 49 M.1: Dyson not published 50 M.2: Dyson Reloaded not published 51 M.3: Dyson Reloaded Reloaded not published 52 M.4: Dyson Reloaded3 not published 53 E.1: Oh, these batteries not published 54 E.2: Inner resistance not published 55 E.3: Solar panel incident not published 56 E.4: Transforming not published 57 X.1: Purely fractal not published 58 X.2: Just fractal not published 59 X.3: Quite fractal not published 60 X.4: Very fractal not published
1 Tough run not published 2 Electrobell not published 3 Jump not published 4 There’s a current flowing not published 5 A mirror problem not published 6 Supercooled water not published 7 Ecological not published 8 Headshot not published 9 Transportation acceleration not published 10 Closer than it seems not published 11 Soda not published 12 Don’t fall! not published 13 Shoot it down! not published 14 Young’s thermal stress not published 15 Rubber bands not published 16 Bungee jumping not published 17 Fidget spinner not published 18 Insect in amber not published 19 Swung rod not published 20 Deviated not published 21 Slinger not published 22 Energies of rotation not published 23 The Ripper not published 24 Inhomogeneous not published 25 Jáchym-style not published 26 Drop the gallium into hot water not published 27 Another infinite circuit? not published 28 Medal not published 29 Dyson sphere under construction not published 30 Too many cylinders not published 31 Do I hear that? not published 32 We’ll be there in no time not published 33 Boring laboratory routine not published 34 Loud music not published 35 Football player not published 36 Water over gold not published 37 Unbent, unbowed, unsunken not published 38 In the rain not published 39 Fire up the synapses not published 40 Efficient ride not published 41 Hot day not published 42 All the way up, please not published 43 Shower not published 44 Space race not published 45 Gray plates not published 46 Do not drown! not published 47 Pressure cooking not published 48 Thirteen barrels not published 49 Space cowboy not published 50 Pressure cooking reloaded not published 51 Balls of steel not published 52 M.1: Tic-toc not published 53 M.2: Far from school not published 54 M.3: Not falling well not published 55 M.4: Don’t fall at all not published 56 E.1: Breaking a capacitor not published 57 E.2: Ideal voltage not published 58 E.3: Ideal current not published 59 E.4: Loaded triangle not published 60 X.1: A nice cup of tea not published 61 X.2: Cheesy not published 62 X.3: Yoghurt not published 63 X.4: Beer not published
1 Librarian’s problem not published 2 Tough slice of bread not published 3 Curve not published 4 Astral not published 5 Don’t mind the tune not published 6 Little cubes not published 7 Methane not published 8 Do it tomorrow not published 9 Toricelli reloaded not published 10 Effectiveness evaluation not published 11 ’murican not published 12 From Prague to Brno not published 13 And the Sun in Ophiuchus means that. . . not published 14 Bounce from zero not published 15 St. Elmo’s sphere not published 16 Under pressure not published 17 Long drop not published 18 Microrotation not published 19 Perfectly balanced not published 20 Sine not published 21 Chain reaction not published 22 Ready steady not published 23 It hangs – it hangs not published 24 Eccentric travelling companion not published 25 Cuboids up in the air not published 26 Tuning not published 27 Aloha snackbar not published 28 Burst not published 29 Damped oscillation not published 30 Don’t stick your fingers in! not published 31 Dark planet not published 32 Crash not published 33 Just a little closer not published 34 Chain reaction ii not published 35 Newton’s rings not published 36 Short circuit not published 37 Exoplanet not published 38 Tse-tse not published 39 Throwing peas at the wall not published 40 Wire not published 41 Hydrophobe not published 42 Distributed not published 43 Merry-go-round not published 44 Twin paradox not published 45 Vampirectrical not published 46 Focus not published 47 Sisyphean labour not published 48 Spin it not published 49 All day long not published 50 Comfy by the pond not published 51 Toast not published 52 Saw not published 53 You shall not transmit! not published 54 Transit not published 55 Megamagnet not published 56 M.1: Tower builder not published 57 M.2: Tower builder returns not published 58 M.3: Collision imminent not published 59 M.4: Stick like no other not published 60 E.1: Charged Fykosák not published 61 E.2: Náry’s hoverboard not published 62 E.3: Astonished Náry not published 63 E.4: It’s freezing not published 64 X.1: Odysea and Prometheus not published 65 X.2: Who’s gonna survive not published 66 X.3: The winter, again not published 67 X.4: Tiler not published
1 Misbehaved students not published 2 Plastered block not published 3 We’re on a roll not published 4 Cooling not published 5 Wet road not published 6 High five! not published 7 (non)broken thermometer not published 8 Line of apsides not published 9 The fire rises not published 10 Sunny not published 11 The potassium foil not published 12 Tuned not published 13 Pitch-black not published 14 Pyramid not published 15 Battering ram vol. 2 not published 16 Refracter not published 17 The Long Night not published 18 Thick glass not published 19 Wrong slope not published 20 Minimal force not published 21 Laser pointer not published 22 When to stop a catapult not published 23 Alternating-direct 1 not published 24 Tick tock not published 25 Sleepyhead not published 26 Martian not published 27 Nitrogen suffocates the audience not published 28 Exoplanet not published 29 A hideout on the Moon not published 30 Melted down thermistor not published 31 Rotation rotation not published 32 Superpowers not published 33 Ball-ey not published 34 Diodes not published 35 Gardener’s problem not published 36 A merry encounter not published 37 Achilles and the tortoise not published 38 This problem sucks not published 39 Bursting with rage not published 40 Alternating-direct 2 not published 41 Ambulance not published 42 Transmittors not published 43 Homemade maglev not published 44 Accretion is too mainstream not published 45 Wavy electron not published 46 Rising bubble not published 47 A charged spiral not published 48 Washing the dishes not published 49 Amplifying not published 50 Watering not published 51 M.1: Submarine not published 52 M.2: Wet FYKOS-bird not published 53 M.3: Water pump not published 54 M.4: Rocket bird not published 55 E.1: Trinity not published 56 E.2: Náry brawls with numbers not published 57 E.3: Náry works hard not published 58 E.4: CapacitOr not published 59 X.1: We’re expanding not published 60 X.2: fiat lux not published 61 X.3: Christmas not published 62 X.4: Antichemical not published
1 Thoughtful not published 2 Ded Moroz not published 3 Fiat nox not published 4 The runnier, the better not published 5 Brake failure not published 6 Fungus librariensis not published 7 Server not found not published 8 Archimedes drowned not published 9 Carriage on a blind track not published 10 Driving in rain not published 11 On your own drive not published 12 The most important letter’s centre of mass not published 13 Sulphuring the barrels not published 14 To jump, or not to jump not published 15 Tea at five not published 16 Scary shopping not published 17 Feed a castle not published 18 Bullet not published 19 Watermelon not published 20 A superconducting one not published 21 Buoyant swings with a pulley not published 22 On the head not published 23 An infinite circuit not published 24 Bowling with a physicist not published 25 Waves and wavelets not published 26 Rolling cylinder not published 27 Zdeněk’s sphere not published 28 Energetic surface not published 29 Pyramid’s circuits vol. 2 not published 30 Gassed joules not published 31 Elusive lens not published 32 Playing in the field not published 33 Planet Fykosia not published 34 Feather-light not published 35 An accelerated one not published 36 Resistance upside down not published 37 Nomen omen not published 38 Pendulum not published 39 Magnetic focusing not published 40 Slingshooty not published 41 Little gifts not published 42 Van de Graaff not published 43 M.1: Electrical shopping cart not published 44 M.2: Náry’s academic quarter not published 45 M.3: Truly solid lecture notes not published 46 M.4: All in vain not published 47 E.1: The long one and the wide one not published 48 E.2: One, two, three,... not published 49 E.3: Experimental afternoon not published 50 E.4: Pyramid’s circuits not published 51 X.1: Uncertain bacteria not published 52 X.2: A lecture on relativity not published 53 X.3: Hot grating not published 54 X.4: Beta decay not published
1 Jumping dog not published 2 Source of radiation not published 3 fluctuational not published 4 Czech energetics not published 5 Fall one not published 6 Choo choo train not published 7 Collision!!! not published 8 Semicircular analyzer not published 9 Upgrade not published 10 Let there be equality not published 11 Apple cider not published 12 Wien’s filter not published 13 Pseudo-ice tea not published 14 Climbing acetone not published 15 The round one not published 16 The bulb and the capacitor not published 17 The rod on the wires not published 18 Totem not published 19 Solar mania not published 20 A decaying one not published 21 Thermo-sphere not published 22 Analogue hydrometer not published 23 Pressurized box not published 24 World champion in high jump not published 25 Pulleys not published 26 Boxed light not published 27 Enlightened carriage not published 28 Earth-cylinder not published 29 Pass me the hammer not published 30 A messy one not published 31 Valuing the decays not published 32 Flash not published 33 We need to go deeper not published 34 Little skewer not published 35 Tesseract not published 36 Short hands not published 37 Resistant Fibonacci not published 38 M.1: Stilettos not published 39 M.2: Traffic jam not published 40 M.3: Very slow relativity not published 41 M.4: Splash not published 42 E.1: flash not published 43 E.2: Tangled resistances not published 44 E.3: Aberration not published 45 E.4: Useless work not published 46 X.1: Let’s spread out not published 47 X.2: Heating season not published 48 X.3: Hexagonal sphere not published 49 X.4: firm or springy not published
1 Curtain not published 2 Hangmen not published 3 Blue rock not published 4 Gas block not published 5 Marble play not published 6 Springy one not published 7 Expandable balloon not published 8 Resistant prism not published 9 Satellite not published 10 A loop not published 11 Ecologically passive not published 12 Nucleus on a diet not published 13 Music of the locomotives not published 14 Capacitors in the circuit not published 15 Glasses or contact lenses not published 16 Superluminal electron not published 17 Ecocar not published 18 Swinging barrel not published 19 Capacitor duo not published 20 Heureka not published 21 Ecology above all not published 22 Resistor blackbox not published 23 Orbiters not published 24 Mercujet not published 25 Dimensionless hydrogen not published 26 Jumping dog not published 27 P5 not published 28 Weird gravity not published 29 Gramme of hexagram not published 30 Crystal mirror not published 31 Running mirror not published 32 Charged robber not published 33 M.1: Drive safely! not published 34 M.2: Wheelspokes not published 35 M.3: Spleen on a bridge not published 36 M.4: Broken altimeter not published 37 E.1: A different one not published 38 E.2: Firefly not published 39 E.3: Shut it down! not published 40 E.4: Anullator not published 41 X.1: In the subway not published 42 X.2: Crash not published 43 X.3: Blip not published 44 X.4: Cracking right now not published