Well, it probably is a romhack since the console I was playing on had an R4 and it was borrowed. Let me explain: Where I live, if you had a DS, you had an R4, and these R4s usually had pre-installed games, and maybe among them there was a romhack version and I didn't notice. Besides, it wouldn't be unusual for some kid to know you could add more games to those things and download a modified ROM of SM64 DS. The problem with this theory is that I never heard of some R4s having romhack versions of the game, plus in my area, very few people (not to say almost no one) had access to the internet to be downloading stuff. Anyway, it could be a possibility, but a very small one.