Gear Ratio Puzzle: Spin Right

Place gears so the output turns exactly as asked. Connect the motor to the output axle and match goals like "clockwise ×2" or "counterclockwise ×1/2". The rules are those of real machines: • Meshing gears turn opposite ways • Speed changes by driver teeth ÷ driven teeth • Double gears on one axle multiply the ratio • A belt turns the other axle the same way at the same speed • A gear pushed two ways, or touching a brake, locks everything Solve with the fewest gears for three stars. Every one of the 120 puzzles is checked by a solver for a solution and its fewest gears. SIX CHAPTERS 1. Which Way? (free, 20 puzzles) 2. Faster, Slower 3. Double Gears 4. Belts 5. Brakes and Fixed Gears 6. Everything Together FULL VERSION (one-time in-app purchase) Chapter 1 is free. The full version adds 100 puzzles in chapters 2 to 6. No subscription, no ads. ACCESSIBLE • Hints show the next gear • Undo and clear • Playable with VoiceOver: every axle reads its gear and how it turns • With Reduce Motion on, arrows replace the spinning • Dark Mode and larger text PRIVACY No sign-in. Your progress stays on this iPhone and is never sent anywhere. No ads, no analytics. Works in Airplane Mode (only buying and restoring need the network).