The Mega Bonus powerup is the name given to a variant of the regular credits powerup, in which it gives out more money than it. In Carmageddon: TDR 2000, this powerup is called Loads of Cash. It gives out a random amount of credits, ranging from 2000 to 10000, in intervals of 100. The powerup doesn't quite have a name, but the comments in the Random Selection powerup inside the POWERUP.TXT files, reference it as "Mega Bonus".