CBO Games
Game guides
How to play
- Select an empty cell and a number; check row, column and box.
- Use notes for candidates. Notes are not final answers.
- Read the reasoning in hints. Three mistakes are allowed; undo changes the board or notes but does not restore lost lives.
Levels & challenges
Free play offers four difficulties. Practise single candidates and unique positions before moving up.
Choose daily puzzles by date. Restart in MENU requires confirmation and resets the same puzzle’s board, notes, timer and help history rather than drawing a new puzzle.
Bosses & special rules
There is no combat boss. Candidate restrictions are the challenge; helper highlights support reasoning without replacing it.
Hold a number cell for two seconds to inspect legal positions. Holding an empty cell writes candidate notes only when helper marking is enabled.
A useful approach
Questions
Why is a number wrong if its row has no repeats?
It must also satisfy the column, box and correct solution.
Why did undo not restore my heart?
Undo affects board and notes, not lives.
Why did holding an empty cell not create notes?
Enable helper marking in MENU, then hold for two seconds.
Account & troubleshooting
Google says this sign-in is not linked?
For a first visit, confirm creation of a Web member in the original tab, then select Confirm and continue. To add a provider to an existing membership, sign in with the linked provider first. Matching email addresses do not merge accounts.
The confirmation record disappeared after closing a tab?
Open My account and check the original operation. Use the Google or Apple recovery option when offered. Check pending results before retrying; keep site storage and avoid repeatedly creating new accounts.
Where can I change my name? Does iOS share it?
Save a 1–20 character Web member nickname in My account. Web and iOS accounts, progress and assets are separate. Maomao leaderboard names are registered separately.
Progress or pictures will not load?
Check the connection, signed-in membership and sync status. Keep the original tab and retry. Avoid multiple writable tabs for one game. Do not clear storage or reset progress first. Contact us with the game, level/date, browser and error text, never passwords or codes.
Analytics permission is saved but tracking is blocked?
DNT, GPC and blockers can still prevent analytics connections. Refusing analytics does not affect play. Analytics permission and ad availability are separate.