Hi all. Cogismo is a free puzzle app. It's tough, and aimed at people who want a challenge. There are 272 puzzles, over 5 difficulty levels, pre-loaded. All of the level 1 puzzles can be solved in under 40 seconds, but most of the level 5 puzzles have never been solved. Be the first! Google Play Store : https://play.google.com/store/apps/details?id=theguild.cogismo.std Cogismo website : https://cogismo.com/ There is no luck in Cogismo, and your Cogs are not demonically possessed. Cogismo logic puzzles work using just four simple rules: 1) Each Cogismo puzzle is made up of nine cogs. At the start of the puzzle each cog is displaying a number between zero and nine. 2) When you tap on a cog, that cog will rotate 90 degrees clockwise and the number being displayed on the cog will be incremented by one. A one will become a two, a two will become a three, etc. When a nine is tapped, it will become a zero 3) Rule 3 – The puzzle is solved when you get all nine cogs to display the number zero. It’s that simple, except for one little thing… Rule 4 – The cogs have one or more teeth protruding from the side. Two teeth can never occupy the same location. When a tooth on a rotating cog strikes a tooth on a stationary cog, then the stationary cog will rotate (just as if you had tapped on it).