LITS
LITS, formerly known as Nuruomino, is a binary determination puzzle published by Nikoli.Rules
LITS is played on a rectangular grid, typically 10×10; the grid is divided into polyominoes, none of which have fewer than four cells. The goal is to shade in a tetromino within each pre-printed polyomino in such a way that no two matching tetrominoes are orthogonally adjacent, and that the shaded cells form a valid nurikabe: they are all orthogonally contiguous and contain no 2×2 square tetrominoes as subsets.History
The puzzle was first printed in Puzzle Communication Nikoli #106; the original title is a combination of 'nuru' and 'omino'. In issue #112, the title was changed to the present one, which represents the four tetrominoes used in the puzzle: the L-shape, the straight, the T-shape, and the skew.
