TL:DR; Probabily the most challenging Tetris game ever, because you have to play three at the same time!
In the game of Tetris you control the position of the dropping block so that a complete row is formed, when that happens, the row will be destroyed. This game is challenging because you have to play three tetris games at the same time!
3D Meditator is based on the idea of tetris. The game is unique with it's 3D effects. The bonuses are also unusual:"Bomb"(blows up several lines of blocks), rotating bonus (the glass turns over with all it's content), special figures and others.
Throw a mouse in the air and watch how far it bounces. Try to get the mouse pointer arrow indicator to stop at 45 degrees and stop the meter at its maximum. Then, watch the mouse bounce over distances of 350 feet.
Puzzle Ring is yet another game based on falling bricks concept. The aim is to build as much horizontal rings of falling blocks as you can. Every complete ring you made disappears making free space for the next blocks.