Independent programmers are working on ways to listen to Internet radio and wirelessly check e-mail through the handheld Nintendo DS game device. Elsewhere, some jokers figured out how to get a playable version of ''Doom'' onto the iPod.
When one popular Tetris-like game, called ''Lumines,'' was not released for the Nintendo GameBoy, one programmer made his own knockoff version, which he called ''LumineSweeper.''
These are the things that happen inside the ''homebrew'' scene, the online place where hacker skills and video game culture overlap. For the enthusiasts in this community, figuring out how to make a Nintendo game work on a Sony device is as much fun as playing the games.