Stack

In Stack a tower as high as possible needs to be built by stacking blocks. Blocks appear from different directions on the screen and the player has to tap in a timely fashion to align the block on the one below. If the aligned block exceeds the one beneath it, it gets trimmed. That way, the tower surface gradually gets smaller and the difficulty increases. When there is no more room to build the game is over. The game is free-to-play and through an in-app purchase the advertisements can be removed. Later updates introduce new types of blocks such as gold, jelly and retro.