Block is like Tetris meets Sudoku. It's got the blocky-feel of Tetris but it's more of a slow-burning, thinking puzzle game, like Sudoku. The concept is simple: fit the blocks together in different-shaped squares without rotating them. There are five different, free levels of difficulty and you can buy more. It's so simple you can pick it up in seconds and it starts really easy but it gets very tough. Block is not a fast-paced game of skill like Tetris but it is a perfect fit for puzzle lovers.