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

Tetris Codes
• Level Never Increases
  6DB4-1F65
• After The First Level Your Level Increases Every Line
  DFB4-1405
• The Same Piece Always Drops
  CBB7-C460
  D4B7-C4A0
  DDB7-C7D0
• Always At High Speed
  CBB2-3DA9
  DCB2-3FD9
  3CB2-3F09

Dr. Mario Codes

• The Same Piece Always Drops – Until You Hit The Change Button
  CBC9-4466
  DCC9-44A6
  3CC9-47D6
• The Same Piece Always Drops
  CB67-37DC
  DC67-370C
  3C67-376C