Downloading Tetris'09 1.1 for Mac from our website was free. Tetris'09 for Mac belongs to Games. The actual developer of this free Mac application is ALSEDI Group.
From the developer:
Tetris'09 is a simple Tetris implementation for MacOS. Tiles, background, and window size are customizable. Without amazing sounds and visual effects, the game is build in the classic style of ordinary Tetris games. All you need to do is rotate the elements while falling down to a position that you fully control. When a horizontal line is assembled, the elements disappear and you score points.
You may want to check out more software for Mac, such as Steve the Sheriff, Zulu's Zoo or Hexriffic, which might be related to Tetris'09.