Tetris Guideline

The Tetris guideline is the current specification that The Tetris Company enforces for making all new Tetris games alike in form. A mode labeled "standard" or just plain "Tetris" will adhere to the Guideline more closely than other modes.

Current rules include:

• 22x10 cell playing field
• Tetromino colors
  • Cyan I
  • Yellow O
  • Purple T
  • Green S
  • Red Z
  • Blue J
  • Orange L
• Tetromino randomization
  • Tetrominoes are generated 7 at a time as a permutation. [1] (There are 5,040 different such permutations.) This means that only 12 tetrominoes can come between one I and the next I.
• Tetromino spawn locations
  • The I and O spawn in the middle columns
  • The rest spawn in the left-middle columns
  • The tetrominoes spawn horizontally and right-side up.
• Tetromino rotation and lockdown behavior (see SRS)