One of the easiest ways of filling your phone with an endless supply of games, without paying a penny is, without doubt, this excellent Gameboy emulator for Nokia Series 60 phones.

The program allows you to run all sorts of ROM files, including Gameboy original and Gameboy Color and run ZIP files without having to decompress them.

You can find public domain ROM files at: www.pdroms.de or at www.zophar.net.

On the negative side, GoBoy is not capable of emulating sound, or multi-player mode, nor can it save games. However, a patch is available at the publisher's website, which promises to fix these errors.