Hi there!

Here are the main categories that are played for Diddy Kong Racing :

• Adventure 1 100%
• All Trophy Races (Available only in Single Player)
• Adventure 1 Any%
• Individual vehicles categories (Available only in Single Player)
• Individual levels (without balloons and opponents) (Available only in Single Player)

Most of these are only available for single player. There's a cheat code you can input in order to use 2 players in Adventure 1 and 2, although I don't think rubberband can apply in DKR and here's why : The game has lag variations pretty much everywhere. In general, if too much stuff (or opponents) are on the screen at the same time, the game will run at a lower framerate and therefore, will influence the speed cap you can get out of zippers & blue balloons. Basically, having opponents (or a second player) near us while taking a zipper or a blue balloon will generally cause slowdowns. Here's a video showing how framerate is calculated in DKR :

Thank you for your finding and taking the time to contact other communities, as I'm sure it will be used in many racing games. The DKR community appreciates your reach! :)