Transmission Ratio Puzzle • 30 Levels
Goal: Make the target gear spin at the required RPM and direction.
Driver (orange): Always spinning at 60 RPM. Its teeth are fixed.
Target (green): Must reach the exact RPM and direction shown.
Gears: Tap empty gears to assign teeth from the palette. Tap again to cycle.
Locked: Some gears have pre-set teeth you cannot change.
Gear Physics: When two gears mesh, RPM_out = RPM_in x (Teeth_in / Teeth_out). Direction alternates each gear.
Example: A 12-tooth driver at 60 RPM meshing with an 8-tooth gear: 60 x 12/8 = 90 RPM, reversed direction.
Target reached!