Free the Ball

The idea is a ball, a maze of walls, and a goal tile, but you don't move the ball directly, you slide blocks around it to open a path, one push at a time. Because you're rearranging the maze rather than steering through it, most levels come down to figuring out the one sequence of moves that doesn't trap the ball against a wall. There's a large stack of levels here, and they escalate at a reasonable pace rather than throwing complexity at you all at once.