Rescue Heroes: Billy Blazes!

Rescue Heroes: Billy Blazes!
Developer: WayForward Technologies Publisher: Vivendi Universal Games Platform: Game Boy Advance Released in US: August 27, 2003 This game has debugging material. This game has a hidden sound test. This game has a hidden level select.

<Shard_> so rescue heroes, the game about the kid from Commander Keen

Level Select

Press L, R, Up and Start at the same time while at the WayForward Technologies logo. You'll go to this menu, which lets you warp to any level, cutscene, or menu in the game.

(Source: gilpelotas (GameFAQs))

Sound Test

Gameshark code 03002F742E will boot into a sound test where you can listen to all the music in the game.

(Source: nensondubois)