Crash Advance IV is a pirate game for the Game Boy Advance. It is based off of an engine used in many Sintax games (Rayman IV, Spider-Man, Digimon Adventure, etc..), and as such, it has the same bugs/glitches that the others do.
The game is undumped, and sometimes does not even work on original hardware due to problems with encryption. It is notable for having been described on the Crash Mania forums in 2006, 9 years before any footage or other information was available for it, in a way that became a running joke on that forum.[1]