Tetris

Tetris was created in 1984 by Alexey Pajitnov, a researcher at the Soviet Academy of Sciences in Moscow, on an Electronika 60 computer that could not even draw solid blocks — the first pieces were made of bracket characters. Five years later the Game Boy version turned it into a global phenomenon, and it remains one of the most-played video games in history.

This version plays by modern conventions rather than loose approximations. Pieces are dealt with a 7-bag randomiser — every set of seven pieces contains each tetromino exactly once, so droughts are capped and you can plan around the next queue shown on the right. Rotation uses the SRS system with proper wall kicks (the I-piece has its own kick table), and you get a hold slot, soft and hard drops, an optional ghost piece showing where the current piece will land, plus combo and Back-to-Back streak bonuses on top of level-scaled line scores.

The core strategy is stack management: keep the surface flat, avoid burying holes, and reserve a single-column well for the I-piece so you can score Tetrises — four lines at once — instead of drip-feeding singles. Use hold aggressively to bank an I-piece or escape an awkward S/Z, and remember gravity accelerates every level, so build habits at low speed that survive high speed.