About Primes

Primes is a number-sorting puzzle built around blue and red balls. Incoming balls show either 7 or 9, and each must be collected in the bowl associated with prime or non-prime numbers. The bowls swap positions when you hold and release the mouse, so classification and timing are linked.

The game asks you to recognize the number on a ball and arrange the bowls accordingly before collection. Since 7 belongs with prime-numbered balls and 9 belongs with non-prime numbers, the key challenge is switching the blue and red bowls at the useful moment. Its small rule set makes every mouse action meaningful.

How to Play Primes

Hold the mouse button to prepare a bowl swap.

Release the mouse to switch the blue and red bowls.

Send balls marked 7 toward the bowl containing prime-numbered balls.

Place balls marked 9 with the non-prime-numbered balls.

Repeat the swaps as new numbered balls arrive.

Tips & Tricks

1Read each printed number before releasing the mouse so the bowls are in the needed order.
2Remember that 7 is prime while 9 is not, then match each ball without guessing.
3Make one clear swap for the next ball instead of changing the bowls repeatedly without a classification plan.