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.