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The goal is to combine the blocks to get prime numbers. When a prime number is found, the blocks will explode and drop those above which can in turn train primes and so on.

There are 4 modes:

- original mode : no limit, for training

- timed mode : you have 45s to make the biggest score you can, you'll get time bonus for each primes

- survival mode : the time to make a move is decreasing, if you don't made a move when the time is elapsed, the game is over

- 501 mode : like darts,

Chains of Primes