245+ iOS apps & games curated and reviewed
The best the impossible letter game on iPhone average 3.6★ across 245+ titles — we've ranked them by what real users actually keep on their phones. Updated September 2026.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 |  | Free | 4.6★ (17K) | Yes | Yes | Sep 2026 | |
| 2 |  | Free | 2.7★ (6) | No | No | Sep 2026 | |
| 3 |  | Free | 4.2★ (20) | Yes | Yes | Aug 2026 | |
| 4 |  | Free | 4.2★ (89) | No | Yes | Aug 2026 | |
| 5 |  | Free | 3.6★ (442) | No | Yes | Sep 2026 | |
| 6 |  | Free | — | Yes | No | May 2026 | |
| 7 |  | Free | — | No | No | May 2026 | |
| 8 |  | Free | — | No | No | May 2026 |
Test your visual acuity and focus with this challenging puzzle game. It presents simple yet incredibly difficult levels designed to push your observational skills to the limit. Prepare for an extreme eye exercise.
Test your visual perception and focus with a challenging game that requires you to find the single mismatched letter among many. It's a simple concept that quickly becomes incredibly difficult, pushing your observational skills to their limits.
Challenge your observation skills by finding the one different letter among a group. Enjoy three distinct game modes designed for quick play and easy understanding, suitable for all ages.
