Why Four Rows at Once Pay Off
Tetris rewards a player for clearing several rows with one piece, and clearing four at once is the biggest single-clear bonus in many versions. The required piece is the long, straight tetromino, often called the I-piece. It can fill a four-cell-deep gap in one column, completing four nearly full rows together instead of clearing them separately. The precise points vary by game, but the incentive is the same: save the right opening for the right piece.
Building a Well Means Waiting
To set up the move, players stack blocks while leaving one narrow, vertical gap—a “well”—running through the pile. The rows above it must be filled almost completely, with the well as their only missing space. When the I-piece arrives, dropping it into that channel can erase all four rows in one move.
The setup turns ordinary stacking into a wager. Every piece that does not fit the well may make the pile taller, and a tall stack leaves less room to recover from awkward shapes. The player is trading immediate, safer clears for a larger reward that depends on both the board and the next pieces dealt.
The Risk Is Part of the Strategy
A good player does not simply wait forever for the long piece: clearing a row or reshaping the stack can be wiser if the pile is getting dangerous. That tension is what makes the four-line clear more than a scoring trick. The board becomes a plan with a deadline—keep the well open, but not so long that the search for one perfect piece ends the game.
