Prime Hunter - online puzzle game

overview

Prime Hunter is a number puzzle game that challenges your knowledge of prime numbers. Each round presents a grid filled with random numbers. Your task is to identify and select every prime number while avoiding composite numbers. The game features multiple difficulty levels with increasing grid sizes and number ranges.

rules

• A prime number is only divisible by 1 and itself (e.g., 2, 3, 5, 7, 11).
• The number 1 is NOT a prime number.
• 2 is the only even prime number.
• Select all primes in the grid and avoid selecting any composite numbers.
• Use Check to verify your answer. All primes must be found with no mistakes to win.

controls

• Click or tap a number to select it (you think it's prime).
• Click again to deselect.
• Press Check to see if your selections are correct.
• Press Hint to reveal one unfound prime.
• Press New Game to generate a fresh grid.

scoring

Your performance is measured by time and accuracy. Finding all primes quickly with no incorrect selections earns the best score. Each hint used adds a small time penalty. Harder modes with larger grids and bigger number ranges are worth more bragging rights.

tips

• Remember: 2 is prime, but all other even numbers are not.
• Quick divisibility tests: if a number ends in 0 or 5 (and isn't 5), it's not prime.
• For larger numbers, check divisibility by 2, 3, 5, 7 — that covers primes up to 120.
• Start with obvious primes (2, 3, 5, 7, 11) then work through harder numbers.
• Use the Hint button when stuck on a tricky number.

faq