Chess Codex vs 9BLOCK
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Chess Codex
Read full descriptionHide full description
Chess Codex is a calm, beautiful place to get sharper at chess. 20000+ hand graded puzzles take you from your very first checkmate to tactics that will test a club player. Every puzzle is a real position with one best move to find. Spot the fork, land the pin, set up the mate. Play offline, anywhere. No account, no sign up, no clutter. Chess Codex is part of Penrose Park Puzzles, a family of premium puzzle games.
9BLOCK
This minimalist game challenges your visual recall and focus by requiring you to memorize the order of numbers on nine blocks. It's a quick, engaging experience that's easy to learn but difficult to master.
- Memorize number order
- Tap numbers 1-9
- Improve longest streak
- Ranked progression
- Customize blocks and reveal time
- Track personal bests
Read full descriptionHide full description
Nine blocks reveal nine numbers. Memorize the order before it disappears. Then tap from 1 to 9 without a mistake. It sounds simple. It isn't. 9BLOCK is a fast-paced, minimalist memory game that tests your visual recall, focus, speed, and consistency. Every attempt takes only seconds, making it easy to play and difficult to put down. PLAY YOUR WAY - Improve your longest streak - Climb through ranked progression - Customize the number of blocks and reveal time for practice - Track your personal bests - Challenge yourself with faster and harder rounds EASY TO LEARN. HARD TO MASTER. There are no complicated controls or lengthy tutorials. See, remember, and tap in order. Can you master 9BLOCK?
Screenshots
Verdict
The clearest difference is ads: 9BLOCK at none against Chess Codex's shown. Chess Codex's advantage is update cadence (every 3 days vs every 3 weeks). On price, in-app purchases, device support and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Chess Codex ships an update every 3 days, 9BLOCK every 3 weeks. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.
| Parameter | Chess Codex | 9BLOCK |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (3 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 3 — better |
| Update frequency | Every 3 days — better | Every 3 weeks |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 15.1 | 15.1 |
| Further details — not scored | ||
| Size | 36 MB | 23 MB |
| Age rating | 4+ | 4+ |
| Developer | Vince Lubbers | Duncan Fondren |
In-app purchases
Chess Codex
No in-app purchases
9BLOCK
No in-app purchases
