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: There's that neat oracle thing which predicts your next choice of two options in a ridiculously simple way.
gollark: * 158 responses
gollark: People are apparently *really awful* at random numbers, and in the 200ish responses there is a significant peak around 7 somehow.
gollark: This actually reminds me of my friend's ongoing thing where they put "DM me a random integer between 0 and 10" in their Discord status, and collated the responses.
gollark: Have you *asked* people this? That seems like a weird response.

See also
  • List of Nikoli puzzle types
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