43. Tetris
We’d be remiss if we didn’t mention this classic block puzzle. Playable on both Android and iOS devices, Tetris is the original block-dropping puzzle game. You can play both Traditional and Quick mode offline – Traditional mode goes until you lose, while Quick mode is perfect if you only have a few minutes to kill. And if you decide to play with an online connection, you can work together with friends to complete objectives or go head-to-head with other players in a last-one-standing Tetris Royale. The gameplay is endless, and so is the fun.