Creating Tetris with JavaScript VI: Making the Game More Complex

A JavaScript Tetris clone changes its post-clear board recovery logic to create a harder gameplay variant.

After completed lines are removed, the board is partially refilled with empty rows and then topped up with random garbage rows.

The number of garbage rows depends on how many lines were cleared, using a 50/50 split biased toward the player.

This simple rules tweak turns standard Tetris into an Insertrix-style challenge by altering the game loop after line clears.