1. Make exactly 24
Use every original number exactly once. Select one tile for a transformation such as √ or !. Select two tiles for +, −, ×, or ÷; the operator tray shows the actual operand order.
Support
How can we help?
24++ works offline for free puzzles and stores progress and preferences on your device. These answers cover the most common questions.
Gameplay guide
Select, sweep, and combine
2. Tap or sweep to select
Tap tiles one at a time, or keep your finger down and sweep through the tiles you want. Selected tiles show operand 1, 2, 3, or 4. A straight diagonal selects the two diagonal endpoints; draw a clear bend into a side tile when you want to include it. Sweeping only adds selections, so tap a tile to correct or remove it.
3. Operate on several tiles
Turn on Multi-Select Operations in Settings to select up to four tiles. After selecting three or four, tap +, −, ×, or ÷ once. The app calculates in selection order: selecting 8, 3, 2 and then − makes (8 − 3) − 2; ÷ works the same way. One Undo restores the whole chain. When the setting is off, you can select at most two tiles.
Common questions
Hints, purchases, and settings
Hints and answers
Hints reveal progressively. If Allow Full Answer is enabled in Settings, the verified worked answer becomes available after all hints. Viewing it marks that solve as assisted.
Restore Full Lab
Open the Full Lab purchase screen and choose Restore Purchases. Use the same Apple Account that bought Full Lab. A network connection may be needed while Apple verifies the entitlement.
Family Sharing
Full Lab supports Apple Family Sharing. Family members must belong to the same Apple family group, have purchase sharing configured by Apple, and use a storefront where the item is available.
Language and appearance
Open Settings to choose System, English, Simplified Chinese, or Japanese, and Automatic, Day, or Night appearance. Changes apply immediately and stay on this device.
Progress and iCloud (version 1.0.1 and later)
24++ stores your game progress and preferences locally on your device. When your devices use the same Apple Account in iCloud, completed progress, best operation counts, assistance status, bookmarks, and skipped puzzles also synchronize through Apple's iCloud key-value storage. Small logical counters and a random device identifier are used only to merge changes. The developer does not operate a server or receive access to your personal iCloud puzzle data. Apple processes iCloud data under its own terms and privacy policy.
Language, appearance, gameplay settings, recently opened locations, and calculations in progress stay on each device. Synchronization may take time; you can keep playing offline and changes can merge when iCloud becomes available. It is not a backup service. Deleting the app removes local app data but does not guarantee removal of iCloud data; synced progress may return on another device or after reinstalling. The developer cannot retrieve or erase your personal iCloud puzzle data for you. Version 1.0 stores game progress locally without this sync feature.
Saved and skipped puzzles
Open Library from the home screen to find Saved bookmarks and Skipped puzzles across all labs. Use Skip on a puzzle board to put an unfinished puzzle aside; use Remove to stop skipping it. Automatic next/continue/random choices exclude skipped puzzles, but you can open them directly from Library. Solving one clears its skipped status and keeps its bookmark. Multi-Select Operations is on by default for new installs; existing explicit preferences are preserved.
Free puzzles
Version 1.0.1 includes 72 free puzzles: 24 per lab, using numbers 1–13. Version 1.0 includes the original 24 free puzzles. Full Lab remains an optional one-time purchase for the complete bank and future bank updates, with Family Sharing and Restore Purchases through Apple.
Still need help?
Email [email protected]. Include your device model, iOS or iPadOS version, app version, and steps to reproduce. Do not include passwords or payment details.