Donkey Kong 64 (also known with the work in progress title of Ultra Donkey Kong, Donkey Kong World or Donkey Kong Universe) is a platform developed by RareWare and published by Nintendo for the Nintendo 64 in 1999. The game is a follow up to the Donkey Kong Country trilogy on the Super Nintendo Entertainment System. There were some rumors about the original release of the game for the 64DD, but in the end DK64 was released on the normal N64, using the 4MB expansion pack.
In the beta version of the game, the characters used “real” weapons models. In the final version they have “fruit” weapons, like coconut gun and peanut shooters. Also, various unused rooms and models were found in the game’s code thanks to hackers! You can see these in the gallery and videos below.
Also Mad Jack, the insane Jack in the Box that Tiny Kong fights in Frantic Factory in the beta was actually going to be called Junk-in-the-box and have the appearance of an old decrepit clown. The area he’s fought in isn’t Mad Jack’s either (info from Mario Wiki). It seems that that when they took him out, the toy box mini boss that Chunky Kong fights was put in instead. It does look like they are fought in the same room though. It also seems that Junk in the box would have shot fire balls (as Mad Jack does now) and would eventually become vulnerable to a TNT barrel instead of being electrocuted.
Thanks to Cubivore10 for the contribution!