IQSnap is a card game in which you test your skill at matching numbers to make 'Snaps'. First you create your 'deck' of cards, shuffle it and deal it into two hands.

Click the **"Play"** button to play the first pair of cards, one from each hand. If you spot a Snap, click the **"Snap"** button. If not, click **"Play"** to continue. Each 'hand' takes it in turn to play.

You can optionally set the game to play cards automatically. See under "Setup help", below, for details

There are six kinds of Snap:

**Times Snap**- if one number is in the other's times table*(is a multiple of the other)*;**Times Table Snap**- if the two numbers are in the same 'times table' of three or more*(have a 'highest common factor' of three or more)*;**Prime Snap**- if the two numbers are 'prime'*(a prime is a number greater than 1 that can only be divided by 1 and itself, eg, 2, 3, 5, 7, 11 ...)*;**Semiprime Snap**- if the two numbers are 'semiprime'*(a semiprime is the product of two primes, eg,*;**6**= 2 x 3,**21**= 3 x 7,**25**= 5 x 5)**Power Snap**- if the two numbers are squares*(eg,*, cubes**25**=5 x 5)*(eg,*, or whole numbers raised to any greater power**27**=3 x 3 x 3)*(eg,*.**32**=2 x 2 x 2 x 2 x 2)**Add Snap**- if the digits making up the two numbers add up to the same sum,*(eg, the digits of*.**32**and**14**both add up to**5**, or the digits of**7**and**43**both add up to**7**)

You win a point for every correct Snap, and lose a point for every incorrect Snap. To deal a new set of cards, just click the "Deal cards" button. This will also bring your current game to a end.

You can also turn all the different kinds of Snap on or off for any particular game.

Deck size: **0**
Cards played: **0**
Cards left: **0**

We advise starting the deck with 2 *(1 gives a Snap every time)*. If you're a beginner, best end with a small number, and increase the deck size as you gain experience. IQSnap works with numbers up to 1 million *(experts only!)* - but allow a few minutes to shuffle and deal the cards!

You can optionally set the game to play cards automatically - just give the number of seconds between plays *(this can include a decimal point, eg, enter '2.5' for two and a half seconds)*. For periods of more than 2 seconds, the "Snap" button will go orange for the last second by way of warning.

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Snaps: **0**
Incorrect Snaps: **0**
Missed Snaps **0**
Total score: **0**
Possible score: **0**

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Keyboard shortcuts: P/p = "Play"; S/s/spacebar = "Snap"; E/e = "End game".