Spin Those Gears is gear (cogs) based puzzle game, where you have to construct various gearings (or gear trains) to make specific gears to spin at particular speed.
Having a correct gear ratio is important in this game, but remember, time is against you. The faster you complete the level, the more score you gain.
So, are you able to fix the machine by making it's gears to rotate at right speed?
This game comes with 20 completely free levels with no in-game ads.