How to play
Click cells to mark them. Right-click to flag. The rule list stays visible on the right side of the board.
Game features
- Sixty hand-built boards
- Built-in hint system, one cell per board
- Daily puzzle plus freeplay
- Save resumes per-board state
- Single-tap input on touch devices
- No real-money purchases
Editor review
Deck Codex pairs a four-rule logic grid with a tiered difficulty curve and a small set of progression milestones. The progression is the design choice that lifts the title above the usual sudoku-clone. You unlock new rule combinations as you clear tiers, which means a returning player encounters fresh interactions rather than the same rules at a higher cell count.
The hint button gives one cell per board. Used hints reduce the score by ten percent. That trade is reasonable; players who hate hint pressure will leave it alone and players who want progress can rent themselves out of a stuck board.
Played over a week, mostly on Liverpool Liverpool Merseyrail rides. The boards fit the session length and the auto-save handles mid-board state correctly.
The flaw is the soundtrack. The ambient track loops over a short interval and starts to grate by board ten. Mute and play with phone audio off. Four stars; the puzzle work is the strongest section and the audio is the weakest.
Vikram Singh covers Puzzle and logic games for Drift Deck, based in Delhi.
Frequently asked questions about Deck Codex
How do I play Deck Codex?
Click cells to mark them. Right-click to flag. The rule list stays visible on the right side of the board.
Is Deck Codex free to play in my browser?
Yes. Deck Codex runs free in any modern browser. No installation, no signup, no payment required. Click the play button to load the game.
Does Deck Codex work on mobile devices?
Deck Codex runs in mobile browsers on iOS and Android with touch controls. Most puzzle games on AJ Arcade support both desktop and mobile, though precision-heavy titles tend to play better on desktop with a keyboard or gamepad.
Who reviewed Deck Codex on AJ Arcade?
Vikram Singh reviewed Deck Codex. Their full editor review appears above and their other coverage is available on their author profile.
Where can I find more games like Deck Codex?
More puzzle titles are available on the Puzzle category page. Every game on AJ Arcade has been played and reviewed by one of our three reviewers before publication.