Engage in a simple yet stimulating calculation puzzle game designed to assess and improve your brain's condition. Solve four-choice math problems by tapping the correct answer to activate your mind. Perfect for a quick mental workout.



248+ iOS apps & games curated and reviewed
Every iPhone needs a few good yontaku apps and games. We benchmark 248+ of them on App Store rating, freshness, and pricing, then surface the standouts so you don't have to scroll the App Store yourself.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 | Free | — | Yes | No | May 2026 | ||
| 2 | Free | 4.8★ (59) | No | No | Oct 2026 | ||
| 3 | Free | 5.0★ (1) | No | No | Oct 2026 | ||
| 4 | Free | 4.7★ (3) | Yes | Yes | Oct 2026 | ||
| 5 | Free | — | No | No | Aug 2026 | ||
| 6 | Free | — | No | No | Aug 2026 | ||
| 7 | Free | — | No | Yes | Sep 2026 | ||
| 8 | Free | 4.8★ (24) | Yes | Yes | Oct 2026 |



Engage in a simple yet stimulating calculation puzzle game designed to assess and improve your brain's condition. Solve four-choice math problems by tapping the correct answer to activate your mind. Perfect for a quick mental workout.











This app offers online trading card lotteries with high return rates and winning probabilities. Users can open packs, aim for rare cards from popular series like Pokémon and One Piece, and build powerful decks. It provides a convenient way to collect cards without visiting physical stores.