This is an example of a completed LITS puzzle. The grid is split up in to regions with at least 4 cells
each, your aim is to insert a Tetromino in each region such that,
- Two Tetrominoes of the same type can't touch horizontally or vertically. Additionally,
this applies to rotations and reflections as well.
- The Tetrominoes should form one continuous area.
- 2×2 filled cells are not allowed.
Tetrominoes are the possible shapes made of 4 connecting cells. There are 5 Tetromino shapes in total: L, I, T, S, and O, but
rule 3 means we can't use the 'O' Tetromino. This is where the name of the puzzle comes from.