The following are known GameShark Codes for The Next Tetris on Sony Playstation (PS1).
These codes were also known as Action Replay Codes and in most cases will work on both devices.

These codes are for the U.S. version of the game.

• Infinite Timer
  801187F0 0078
• Maximum Score
  8018E420 FFFF
  Note: This codes works on both Player-1 and Player-2.