テトリス

Play Tetris online free at PlayDeck -- no download, no signup needed. Tetris is arguably the most iconic video game ever created. Designed by Soviet software engineer Alexey Pajitnov in 1984, it has sold hundreds of millions of copies across every platform imaginable and remains a staple of gaming culture. The rules are elegantly simple: seven different shapes called tetrominoes (I, O, T, S, Z, J, L) fall one at a time from the top of a 10-wide playing field. Your job is to move and rotate each piece so it fits snugly with the blocks already on the board. When you fill a complete horizontal line, it clears from the field, earning you points. Clear multiple lines at once for bonus points -- a four-line clear (called a "Tetris") is the highest-scoring single move. As you progress, the pieces fall faster, demanding quicker reflexes and better planning. Advanced players use techniques like T-spins, wall kicks, and back-to-back Tetris clears to rack up massive scores. Learning to think ahead and keep the board flat is the foundation of every great Tetris strategy. Tetris is more than just fun -- research has shown that playing Tetris can reduce cravings, lower stress, and improve spatial reasoning. It exercises the brain's ability to visualize rotations and plan under pressure. Whether you are a casual player looking for quick relaxation or a competitive gamer chasing high scores, PlayDeck Tetris delivers the classic experience right in your browser. Play Tetris unblocked, completely free, on any device.