The legendary block-stacking puzzle game
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The most refined pure puzzle game ever made — 40 years of iteration shows in how well the rotation system and scoring scale from casual to competitive play.
A T-spin occurs when you rotate a T-piece into a tight spot using the Super Rotation System, clearing lines in a way that scores 50% more points than a regular clear. T-spin doubles (clearing 2 lines) are the most efficient scoring move in competitive Tetris.
They are the I (cyan, straight bar), O (yellow, square), T (purple), S (green, right-skew), Z (red, left-skew), J (blue, reverse L), and L (orange, L-shape). Collectively called tetrominoes.
The Tetris Company owns the trademark and licenses it globally. Pajitnov co-founded the company in 1996 and receives royalties — he didn't see any income from early versions due to Soviet state ownership of his invention.