24! is based off the card game by the same name. Never heard of it? Let me explain.In 24, a set of four cards are dealt. The aim is simple: to make the number 24. There are a few rules, however. All of the numbers must be used when making the target, but in any order you wish. The app only allows the standard maths operations of + (add), - (subtract), × (multiply) and ÷ (divide). Some people allow trigonometry, factorials, powers, roots and combining, but this app does not. That would make the game WAY too easy!(In case you forget any of these, just press the '?' in the action bar to show the rules again)Anyway, the app allows you to:- Test your 24-solving skills across a variety of game modes. You can unlock achievements and compare scores with friends using Google Play Games!- Generate random 4 number sets for fun, allowing custom targets and card ranges- Solve any set of 4 numbers for any target, in case you get stuck24 is great for passing time or playing with friends, and helps you strengthen your mental arithmetic and quick thinking skills!P.S Only Android 4.0+ compatible. If your device is not compatible, upgrade it now!