LITS Rules

LITS earned it's name based on the 4 pieces that are used in the puzzle.  The L-shaped tetromino, the I-shaped tetromino, the T-shaped tetromino, and the S-shaped tetromino.  The square tetromino is not used for reasons you will see below.

Here are the rules.

1.  Each region in the grid must contain exactly one tetromino of edge-connected cells.
2.  No tetromino in one region can touch another similarly-shaped tetromino in another region along a cell edge.  (This includes rotations and reflections)
3.  A solved puzzle can have no area of 2x2 black cells anywhere.  (Even if the cells come from different regions.)
4.  All black cells must be connected together through their edges.

Stay tuned for LITS Puzzle no. 1!