Spin Those Gears 2 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. This game comes for free with 15 levels with no disturbing in-game ads as a trial. If you like it, you can upgrade and get full version of application that includes all 40 levels -