Bloxorz is a simple idea for a puzzle game that is beautifully executed. The objective is to tumble a rectangular block through each stage and deposit it into the square hole at the end. Using a series of bridge-opening switches, teleporters, and block-splitting switches, solve the puzzle each stage presents to move on to the next of the game's 33 levels.

Source: http://jayisgames.com/archives/2007/06/bloxorz.php