S-Tetris'99 - Version 2.5 S-Tetris'99 is a little more than just Tetris. It also includes Pentix, a popular variation of Tetris that's more complicated and more interesting, and two additional variations of Tetris (Advanced Tetris and Advanced Pentix). There are also seven different block sets to play with: blocks, numerals, kinetics, dice, wild, planes and misc. You can use your own sound effects if you like, but the pre-set sounds will not disturb you while you play. The background picture can also be changed to your liking. Outstanding graphic is one more advantage, which will bring you to the world of pleasure and fun, to the world of S-Tetris'99.