Green UFO, Inc.

This is how I createdTetra a long time ago. The idea was to make it relaxing, not stresful. But Russian stressful version became top hit.
Tetra
Green UFO, Inc.
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Tetra (greek τετρά) is just a clasic tetromino puzzle.
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Content rating
Everyone
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Tetra (greek τετρά) is just a clasic tetromino puzzle.
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