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.
Chiidoku Maps and Systems
Chiidoku has no maps in the exploration sense — its 'maps' are boards and its systems are four placement rules run across four modes. This is the reference: the official rules, the modes with their documented behaviour, the observed board anatomy, and the parts of the game no source has documented yet.
Core system
The four placement rules
Everything in Chiidoku runs on these — the official listing's rule set, checked 2026-10-08.
One Cat per column
Each vertical column also holds exactly one token — the Sudoku half of the rule set.
One Cat per colour region
Every coloured area of the board contains exactly one token.
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'.
One solution, logic only
The official description promises every puzzle has exactly one solution reachable without guessing.
One community wiki (chiidokugame.wiki) contradicts itself — its homepage says tokens cannot be neighbours while its FAQ says they can, and its adjacency page calls the direction scope unconfirmed. The official listing settles it: two Cats cannot touch, including diagonally — the same rule the listing stated for Chiikawas before the October 2026 rename (checked 2026-10-25).
Mode system
Four modes, one ruleset
The official listing's mode rows with their documented behaviour, plus what each mode's community documentation adds.
| Mode | Documented behaviour |
|---|---|
| Levels (formerly Standard) | The campaign ladder. The October 2026 listing says 'Complete over 1,000 levels, earn coins, set your best win streak'; its September 2026 wording said up to 400 Standard levels. The detailed difficulty bands below are the community wiki's September 2026 observation of that earlier ladder and are not re-verified against the expanded count. |
| Ranked | A race against other players on the same puzzle. Ranked rewards and matchmaking details are not published anywhere. |
| Endless | Randomly generated puzzles that become increasingly hard. The official listing dropped its Endless row in the October 15, 2026 description rewrite; community wikis still describe runs with no fixed final level that continue while you keep solving correctly, and recommend treating Endless as an accuracy challenge rather than a speedrun. |
| Daily Puzzles | A puzzle set that refreshes daily with rewards. The official listing does not name the rewards or the reset hour. |
Board anatomy
What a board is made of
Video-dated observations from the independent fan guide, checked 2026-10-08.
- • Sizes: early campaign levels are 4x4; level 8 is 5x5.
- • Regions: colour areas observed with named notation — Mint (G), Violet (V), Yellow (Y), Pink (P), Blue (B).
- • Controls: one tap marks a candidate X, double tap places; white X marks clear back to empty.
- • Difficulty ladder: community banded as Beginner (1-50) through Hard (301-400).
| Levels | Band |
|---|---|
| Levels 1-50 | Beginner |
| Levels 51-100 | Easy |
| Levels 101-150 | Easy to Medium |
| Levels 151-250 | Medium |
| Levels 251-300 | Medium to Hard |
| Levels 301-400 | Hard |
Source: chiidoku-wiki.wiki (September 2026), checked 2026-10-08.
Undocumented
What the sources do not cover
These gaps are stated so a missing fact is never mistaken for a secret one.
- • Theme names — the September 1, 2026 update advertised new themes without naming them.
- • Ranked rewards, rating, and matchmaking specifics.
- • Daily puzzle rewards and the reset hour (the daily-missions routine handles what is known).
- • Board size ladder beyond the observed 4x4-to-5x5 opening.
- • Any changelog — the creator has never published patch notes; the September 30 and October 8, 2026 structured-data reads confirmed updates shipped with none.
The update watch that fills these gaps lives on the updates page, driven by the official listing's own timestamp.
FAQ
Systems questions
What are Chiidoku's rules exactly?
Four placement constraints, per the official listing (checked 2026-10-25): exactly one Chiikawa per row, one per column, one per colour region, and no two Chiikawas touching — including diagonally. Every puzzle has exactly one solution, reachable through logic without guessing.
How big are the boards?
The campaign starts small: recorded early levels are 4x4 boards, with level 8 documented as 5x5. Boards grow with difficulty from there; the exact size ladder beyond the opening levels is not publicly documented.
How does Ranked mode work?
The official listing describes it as a race against other players on the same puzzle. Rewards, matchmaking, and rating details are not published anywhere. The independent fan guide also cautions that an older September launch notice about Ranked is historical, not a countdown to something new.
What themes does the game have?
The September 1, 2026 update snapshot advertised new themes but named none, and no official source has listed theme names since. Any theme list you find elsewhere is invention — the boards themselves are the only theme menu.
Can two Chiikawas be adjacent?
No. The official listing says two Chiikawas cannot touch, including diagonally. One community wiki's FAQ contradicts itself on this, but the official rule is unambiguous: all eight neighbouring cells of every placement must stay empty.
Related help