UPDATE FOR 1.0:
I've finally polished Factor to where I want it. All new graphics, crash bugs gone (I hope!) saved high scores and an upgrade to Ultimate Fenix. If you enjoyed previous versions of Factor, hopefully this version is a bit more shiny.
The idea of the game is that you need to factor a very large
number which is a multiple of the first 8 primes: 2, 3, 5, 7,
11, 13, 17, and 19. So, for instance:
12355467391260000000 = 2^8 * 3^7 * 5^7 * 7^10
By pressing the left, right, up, down, A, B, X, and Y buttons,
you can attempt to divide the large number by a prime.
I've finally polished Factor to where I want it. All new graphics, crash bugs gone (I hope!) saved high scores and an upgrade to Ultimate Fenix. If you enjoyed previous versions of Factor, hopefully this version is a bit more shiny.

The idea of the game is that you need to factor a very large
number which is a multiple of the first 8 primes: 2, 3, 5, 7,
11, 13, 17, and 19. So, for instance:
12355467391260000000 = 2^8 * 3^7 * 5^7 * 7^10
By pressing the left, right, up, down, A, B, X, and Y buttons,
you can attempt to divide the large number by a prime.
http://www.gp2x.de/cgi-bin/cfiles.cgi?0,0,0,0,37,2494