About LITS
LITS (originally Nuruomino) is a Japanese logic puzzle invented by Naoki Inaba, first published by Nikoli in 2004.
The grid is divided into bold-edged regions. Your job is to shade one tetromino (L, I, T, or S) in every region, subject to four rules:
1. Each region contains exactly one tetromino (4 shaded cells forming L, I, T, or S).
2. Adjacent regions cannot have the same shape.
3. All shaded cells must be orthogonally connected.
4. No 2x2 block of shaded cells.