The following are known Game Genie Codes for Tetris 2 on Super Nintendo (SNES).

• Select Any Round (At Round Select Meter, Keep Pressing ‘Right’ On D-Pad – 1-Player Mode Only)
  9DBD-3DF4
• Tile Speed Always At 0
  CBC5-4FDC
  DDC5-4F0C
  DDC5-4F6C
• Tile Speed Always At 255
  CBC5-4FDC
  EEC5-4F0C
  DDC5-4F6C
• More Time To Place The Blocks Where You Want Them (Even After They Hit The Ground – Left And Right Only Once On Ground)
  6DB1-346B