Permission Research – online consumer market research
Tetrix Collection
A superb collection of 30 great Tetris games...from classics like Tetrix or Pentrix to new, original variations like Tricolorix or Quadrinumerix. You'll find your most addictive Tetris games here! Three basic modes are offered -- try to make rows of blocks, try to connect single blocks of the same color, or try to connect blocks whose sum equals 12. Great fun for any age.

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downloadable tetris game
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