When you start the game and enter the main interface. In an 8X10 checkerboard, 2-3 rows of squares are randomly raised from the bottom. You can only move one square in the horizontal direction at a time, and there is space next to the square to be moved. Block Slider, puzzle game, 1 player, spatial reasoning, brain training, challenging, fun game, clicker game, strategy game, error recovery, puzzle, brain exercise, cognitive skills, mobile game, online game