LITS

LITS, formerly known as Nuruomino (ヌルオミノ), is a binary determination puzzle published by Nikoli.

Moderately difficult LITS puzzle (solution)

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 (with rotations and reflections counting as matching), and that the shaded cells form a valid nurikabe: they are all orthogonally contiguous (form a single polyomino) 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' (Japanese: "to paint") and 'omino' (polyomino). In issue #112, the title was changed to the present one, which represents the four (of five) tetrominoes used in the puzzle: the L-shape, the straight, the T-shape, and the skew (square tetrominoes may never appear in the puzzle as they are a direct violation of the rule).

gollark: https://ark.intel.com/products/88197/Intel-Core-m5-6Y57-Processor-4M-Cache-up-to-2_80-GHz
gollark: There exists a comparison table.
gollark: m5 sounds awful.
gollark: Either that or use the tablet... to buy a better device.
gollark: Well, \@everyone manages to be backslash-escaped.

See also
  • List of Nikoli puzzle types
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