Tetris Guideline

The Tetris guideline is the current specification The Tetris Company enforces for making all new Tetris games alike in form.

Current rules include:
 * 22x10 cell playing field
 * Tetromino colors
 * Cyan I
 * Yellow O
 * Purple T
 * Green S
 * Red Z
 * Blue J
 * Orange L
 * 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.