One Cat per row
Each horizontal row holds exactly one token — cats since the October 2026 retheme; the pre-rename listing called the tokens Chiikawas.
Source: Official listing
Check Your Chiidoku Puzzle Entries
Chiidoku (now listed as Catdoku) allows exactly one token per row, per column, and per colour region. The placement form below takes the notes from your own board: it reports duplicate results for any subject appearing twice in the same row, column, or region, raises an incomplete warning for half-filled entries it holds out of the comparison, and states its tool limits in plain text — a local consistency check against the puzzle's three grouping rules, not a solver.
How the check works
The official rules give every placement three grouping constraints: one token per row, one per column, and one per colour region, plus the adjacency rule that two tokens cannot touch — even diagonally (worded as Chiikawas before the October 2026 rename to Catdoku, Cats in the current listing). This tool automates the three grouping checks. For each dimension you type (row, column, region) it groups your entries and reports any subject that appears more than once in the same group, which is exactly the violation the in-game heart system punishes. It deliberately does not guess: incomplete entries are kept out of the comparison instead of being filled in, and the adjacency rule stays a manual check because the tool never sees real board geometry.
One Cat per column
Each vertical column also holds exactly one token — the Sudoku half of the rule set.
Source: Official listing
One Cat per colour region
Every coloured area of the board contains exactly one token.
Source: Official listing
No touching, including diagonally
Two tokens cannot sit in adjacent cells in any of the eight directions — the Minesweeper-style adjacency restriction. The October 2026 listing words it 'Two Cats cannot touch, including diagonally'.
Source: Official listing
Rules checked 2026-10-25 against the official Roblox listing.
Your notes
Check your attempted placements
Enter the labels from your own puzzle. This checker does not load a game board or solve a level.
Check results
Duplicates and incomplete notes
No duplicate subject appears in the complete entries you supplied.
An empty duplicate result only checks these supplied labels. It does not confirm an in-game board, a solution, a reward, or a character outcome.
Worked example
A documented 4x4 solution, run through the checker
Source: chiidoku.com level answers, from a video dated August 30, 2026 — checked 2026-10-25.
The board and its answer
Chiidoku's early campaign boards are small: level 4 is a 4x4 grid, and the fan-guide level-answers page records its unique solution as R1C2, R2C4, R3C1, R4C3 — Row 1 column 2, row 2 column 4, row 3 column 1, row 4 column 3. That solution also demonstrates the adjacency rule: no two of the four cells share an edge or even a corner, which is why a placement can look "spread out" and still be the only legal answer.
- R1C2
- R2C4
- R3C1
- R4C3
Enter it and read the result
Type the four placements into the tool above: subject A in row 1, column 2; subject B in row 2, column 4; subject C in row 3, column 1; and subject D in row 4, column 3 — with your board's colour-region names in the region field. The checker reports no duplicates, because every subject owns exactly one row, one column, and one region. Now change row 4's subject to C: the tool immediately flags C twice in column 1 and twice in the same row's region groups — the same mistake that would cost a heart in game.
The negative result teaches the flip side: remove the region labels and the two mid-board cells (R2C4 and R3C1) touch diagonally. The tool stays silent about that, which is exactly why the adjacency check stays on your side of the desk.
Interpretation
What a clean result does and does not mean
A green result says your notes contain no grouping violation — it is not a proof that the board is solved.
It does confirm
No subject repeats in any row, column, or region you entered — the three checks the game itself grades hardest on early boards.
It does not check
Diagonal or edge adjacency, board geometry, and the one-solution guarantee. Those stay manual, per the official no-touching rule.
Best use
Mid-puzzle audits on Medium-and-up boards, where a single duplicated region label costs a heart; and Endless runs, where one bad placement ends the streak.
FAQ
Calculator questions
Does the puzzle checker solve a Chiidoku level?
No. It compares the labels you enter and flags duplicate subjects within the same row, column, or colour region. It never loads a game board and never sees your screen — every input comes from your notes.
Why does the checker not test the no-touching rule?
The adjacency rule needs real board geometry — which cells actually touch — and the checker only knows the row, column, and region labels you type. Check the eight surrounding cells by eye; the official rule (two tokens cannot touch, including diagonally — Chiikawas before the 2026 rename, Cats in the current Catdoku listing) makes that a placement-breaker even when every other check passes.
What do I enter for a row and column?
Whatever the board shows: type 1-4 for a 4x4 board, 1-5 for a 5x5, or R1C1-style coordinates if you prefer. The checker only compares what you type, so consistent labels matter more than any particular format.
The checker says no duplicates. Am I safe?
Only for the checks it runs. A placement can pass the row, column, and region checks and still touch another token diagonally, or be wrong in a way that only the board's one-solution logic reveals. Treat a clean result as one green light, not a solution.
Can I use it for Endless mode?
Yes — Endless generates random boards with the same four rules, so the same duplicate checks apply to notes you take during an Endless run.