# 24combo — All Puzzles,Two Player,Solver > All Puzzles,Two Player,Solver (iPhone/iPad app by 杨军 朱.) - Source: https://appshunter.io/ios/app/24combo/id6819238368 (this page in markdown: same URL + `.md`) - Developer: [杨军 朱](https://appshunter.io/developer/564474259) - Category: Entertainment - Price: $0.99 - Age rating: 4+ - Requires: iOS 15.0 · 23 MB - Languages: American English - Released: 2026-10-12 - Data updated: 2026-10-18 ## What is 24combo? Complete 24 Game question bank, featuring three major modes: Level Challenge, Local Split-Screen Two-Player Battle and Solver. Essential for competitions! Train your mathematical thinking and mental arithmetic skills, practice anytime to improve your ability. Local split-screen two-player battle supported, compete with friends in brain challenges. *Level Challenge Mode Three difficulty tiers: Easy, Medium, Hard Boss levels. Covers beginner practice up to advanced competition training, suitable for all age groups. ‑ Full combination question bank: Fully covers all valid combinations of four numbers, with a total of 566 carefully selected puzzles. Difficulty increases gradually to train number combination and logical reasoning skills. ‑ Easy Question Bank (76 puzzles): Only integer solutions. Use basic four arithmetic operations to make 24. Great for children and new learners to grasp fundamental problem-solving ideas. ‑ Medium Question Bank (470 puzzles): Only integer solutions. Multiple number combinations need to be tried to strengthen deductive reasoning and lay solid foundations for competitions, ideal for regular learners. ‑ Hard Boss Levels (20 puzzles): Advanced competition puzzles that cannot be solved only with integer thinking. Fraction operations are required in solving to break thinking limits. ‑ Card interaction: Tap to mark calculation order, simple operation, freely combine numbers for deduction. ‑ Real-time formula display: Automatically records every calculation step, review reasoning logic and summarize problem-solving skills. ‑ Auxiliary tools: Full functions including auto-solve, hints, undo and reset. Get hints when stuck, freely try and error for efficient practice; auto-solve to skip levels supported. *Two-Player Battle Mode ‑ Local split-screen battle: No internet required. Single device supports two-player brain competition anytime with friends. Works on both mobile and computer devices. Note: Non-touchscreen devices only support playing random levels in single-player mode or two-player turn-based play. ‑ Custom battle settings: Set time limits, difficulty levels and allowed skip rounds, freely adjust battle rules. Fair matches for both beginners and experts. ‑ Save previous settings: Automatically keeps battle parameters of last round, no repeated configuration when starting new game. *Solver Mode ‑ 24 Game Calculator: One click to find all valid solutions, verify hard puzzles and learn various solving strategies. ‑ Optimized continuous input: Auto jump to next input box after entering numbers to reduce taps. ‑ Input history memory: Save previous input records for review and repeated verification. *Additional Features ‑ Share function: Send hard puzzles to friends or share completed results for communication and discussion. ‑ Comfort settings: Built-in eye-care mode and sound toggle for long-time practice. 24 Game Rules: Use numbers 1‑10 with addition +, subtraction -, multiplication *, division /. Each number can be used only once. Reach result 24 to clear the level. Division by zero is prohibited. ## Is 24combo safe? Not enough ratings yet to assess 24combo. ## Is 24combo legit? 24combo appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for 24combo is 75 out of 100 points across 7 verification signals from App Store and developer data. ## Version history (last 2 releases) ### 1.0.1 — 2026-10-18 Fix: Skip count 10 gets truncated in two-player game when mobile text scale is 135%. Improvement: macOS automatically retains app window size. ### 1.0.0 — 2026-10-17 No release notes. ## More apps by 杨军 朱 - [Bookmarkers: Smart Manager](https://appshunter.io/ios/app/bookmarkers-smart-manager/id564474256) - [Bookmarkers Pro: Smart Manager](https://appshunter.io/ios/app/bookmarkers-pro-smart-manager/id574292030) - [iShield - Phone Security guide](https://appshunter.io/ios/app/ishield-phone-security-guide/id585932484) - [Shortcut Manager Pro - App Hub](https://appshunter.io/ios/app/shortcut-manager-pro-app-hub/id591392350) - [Shortcut Manager - App Hub](https://appshunter.io/ios/app/shortcut-manager-app-hub/id595156397) - [ScanCode: Create&Track Express](https://appshunter.io/ios/app/scancode-create-and-track-express/id702178487) All apps by 杨军 朱: https://appshunter.io/developer/564474259 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-18.*