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PrimeShooter-more action.png
GenresArcade, educational
Release dateMarch 22nd, 2010
DeveloperPhilip Dorrell
Code licenseGPLv2
Media licenseGPLv2
P. languageECMAScript
PrimeShooter is a free game. This means that the source code is available to be studied, modified, and distributed. Most projects look for help with testing, documentation, graphics, etc., as well.

PrimeShooter is an abstract browser based shooter game licensed under the GPLv2. The player must shoot falling numbers with their divisors and scores points for clearing prime numbers.


In a twist on the classic shoot 'em up genre, this game's enemies are numbers which the player has to shoot with their prime factors. The player can shoot missiles consisting of prime numbers up to 19 with the press of a key, and a special 'P' missile. When an enemy number is hit by one of its prime factors, it is divided by it and continues its march to the bottom. If an enemy is a prime number, however, and it is hit by the corresponding number or the special 'P' missile, it is removed and the player gains a point.

The goal of the game is to reach the highest score possible. Enemy numbers that fall past the bottom of the screen sometimes reappear at the top. Those reappearing numbers are sometimes marked with a deeper shade of red, if these super-activated numbers hit the bottom again the player looses a life. The player also looses a life if a number collides with their gun. For each 50 points the player scores, they are awarded an extra life. As the player's score increases, so does the difficulty of the game which means more simultaneous enemies and higher numbers to factorise, up to a maximum of 500.

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