Enter . It wasn't a game; it was a modified BIOS, a set of instructions that told the Xbox how to wake up. Most retail consoles had "Stock" BIOS that would only run official, signed Microsoft discs. If you wanted to do more, you had to perform a "hardmod" (soldering a chip) or a "softmod" to trick the system into running a different set of instructions.
: Typically distributed as a .bin file, often 256KB or 1MB in size depending on the target hardware. complex 4627 v103