How do you play Primes?
Goal: Balls with a 7 or a 9 on them fall down. Send each one to the right bowl: one bowl is for prime numbers and one is for numbers that are not prime.
- Watch the falling balls: each one shows 7 or 9.
- 7 is a prime number, 9 is not (3 × 3).
- Hold or let go of the mouse button to swap the blue and red bowls.
- Catch each ball in the right bowl to keep going.
What are the controls for Primes?
| Input | Action |
|---|---|
| Hold / release mouse button | swap the bowls |
Tips for Primes
- A prime number can only be divided by 1 and itself: 7 is prime, 9 is not (3 × 3).
- Decide while the ball is still high up, then swap the bowls in time.
- It is a good quick way to practise prime numbers.
Guide written by Gamezylo from the developer’s description and instructions, Oct 7, 2026. If the game plays differently, follow what it shows on screen.
Game details
- Genre
- Prime number sorting game, Puzzle, Brain & Math, Quick games
- Themes
- Math, Number
- Works on
- Computer (mouse) or touch screen
- Screen
- Plays best in landscape
- Added to Gamezylo
- Sep 27, 2026
- Published via
- GameMonetize (third-party developer)
From the developer
Primes is a game where there are two types of balls coming which have 7 or 9 printed on them. They are to be collected in bowls filled with prime-numbered balls or non-prime numbered balls respectively which swap each other by mouse-click hold and release. Have fun :)
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Questions about Primes
How do you play Primes?
Hold or release the mouse to swap the bowls so each falling ball lands in the prime or the not-prime bowl.
What is the goal of Primes?
Sort as many balls as you can into the right bowl.
Is 9 a prime number?
No. 9 = 3 × 3, so it is not prime. 7 is prime, because only 1 and 7 divide it.
Is Primes free?
Yes, it is free to play in your browser on Gamezylo with no download; the game may show its own ads.
Is Primes free to play?
Yes. Primes is free on Gamezylo with no download and no sign-up. The game comes from a third-party publisher and may show its own ads inside the game.
Can you play Primes on a phone or tablet?
Yes. It is played by clicking or tapping.