Nurikabe vs Hitori: Two Nikoli Shading Puzzles Compared
Nurikabe guide · 5 min read
If you enjoy Nurikabe, sooner or later someone will point you toward Hitori, and for good reason. They are close cousins: both come from the Japanese publisher Nikoli, both are solved by shading cells black or white, and both lean on the idea of keeping cells connected. Yet the moment you start solving, they feel completely different. One is about building islands in a sea; the other is about erasing duplicates from a full grid. This guide compares Nurikabe vs Hitori, shows exactly where they overlap and where they part ways, and helps you decide which to play. Fancy the island puzzle right now? Play a Nurikabe puzzle.
The shared DNA
Nurikabe and Hitori grew up in the same house. Both were created by Nikoli, both have a single guaranteed solution reachable by pure logic, and both are shading puzzles: you do not write numbers, you decide which cells are black and which are white. Both also care deeply about connectivity, the rule that certain cells must all join into one unbroken group. If you love the quiet satisfaction of working out a grid one shaded cell at a time, you will enjoy both.
That shared shading-and-connectivity feel is exactly why people group them together. The difference is in what you are shading toward.
How Nurikabe works
In Nurikabe, you start with a mostly empty grid dotted with a few numbers. You shade cells to build a single connected "sea" of black that flows around clusters of white "islands." Each numbered cell sits in an island whose size matches the number, islands cannot touch each other side by side, the sea must all connect into one region, and no 2×2 block may be entirely black. It is a puzzle of construction: you are building shapes, islands and a sea, that fit together perfectly.
How Hitori works
In Hitori, you start with a grid that is completely full of numbers. You shade some of them out so that no number appears more than once, unshaded, in any row or column. The shaded (black) cells cannot touch each other, and the unshaded (white) cells must all stay connected. It is a puzzle of elimination: the grid is overcrowded with duplicates, and you remove the extras until each surviving number stands alone.
Side by side
| Nurikabe | Hitori | |
|---|---|---|
| Starting grid | Mostly empty, with a few numbers | Completely full of numbers |
| What the numbers mean | Island sizes | The grid's contents (duplicates to resolve) |
| What you build | A connected sea around sized islands | Whatever's left after shading duplicates |
| Connectivity rule | The black sea must connect | The white cells must connect |
| Extra rule | No 2×2 all-black block | Black cells can't touch |
| Feel | Construction (build islands and sea) | Elimination (remove duplicates) |
Notice the neat mirror in the connectivity rule. In Nurikabe, it is the black cells (the sea) that must form one connected region. In Hitori, it is the white cells that must stay connected. Same idea, opposite colour, which tells you a lot about how differently the two puzzles think.
Which is harder?
Neither is objectively harder; they stress different skills.
- Nurikabe challenges you to juggle two construction tasks at once: every island must reach its exact size without touching another island, while the sea around them stays connected and avoids 2×2 pools. It is spatial and constructive.
- Hitori challenges you to decide which duplicate to remove, while never shading two cells side by side and never cutting the white cells apart. It is more about elimination and row/column scanning.
Both reach genuine difficulty on large grids, and both rely on connectivity reasoning that beginners often overlook. Many solvers who love one quickly love the other, precisely because the skills overlap just enough to feel familiar while the goals differ enough to feel fresh.
Which should you play?
Play both, honestly. Reach for Nurikabe when you are in the mood to build, to shape islands and watch a sea wind between them. Reach for Hitori when you want the cleaner, more analytical pleasure of clearing out duplicates from a crowded grid. Because they share a publisher, a shading mechanic, and a connectivity rule, learning one makes the other easier to pick up, so they make a great pair to alternate between. (If you want more options, our roundup of puzzles like Nurikabe covers the wider shading-puzzle family.)
The best way to feel the difference is to try the island puzzle yourself. Play a Nurikabe puzzle now, or learn the rules first.
Frequently asked questions
What is the difference between Nurikabe and Hitori?
Both are Nikoli shading puzzles, but Nurikabe has you build a connected black "sea" around numbered white "islands" of a given size, while Hitori has you shade out duplicate numbers in a full grid so none repeats in a row or column. Nurikabe is a construction puzzle (the black sea must connect); Hitori is an elimination puzzle (the white cells must connect).
Are Nurikabe and Hitori the same type of puzzle?
They are close cousins but not the same. Both are shading puzzles from Nikoli that rely on connectivity, which makes them feel related. However, their rules and goals differ: Nurikabe builds sized islands in a connected sea, while Hitori removes duplicate numbers. Even their connectivity rules are mirror images, black for Nurikabe, white for Hitori.
Is Nurikabe harder than Hitori?
Neither is objectively harder; they challenge different skills. Nurikabe is more spatial and constructive (building islands and a connected sea while avoiding 2×2 pools), while Hitori is more about elimination and scanning rows and columns for duplicates. Both become genuinely hard on larger grids.
If I like Hitori, will I like Nurikabe?
Very likely. Both are Nikoli shading puzzles that reward connectivity reasoning, so the core skills carry over. The main adjustment is switching from eliminating duplicates (Hitori) to building sized islands in a connected sea (Nurikabe). Many fans of one enjoy the other as a natural complement.