Note: This thread is not for discussing games that never made it to your particular region, but only for games that were never "officially" released and/or were cancelled. (In example, talking about BS Zelda, the original N64 Animal Crossing or Sin & Punishment--which is actually released for the virtual console on the Wii--would be inappropriate.) No links to ROMs.
So what are your favorite games that were never officially released? Of course, the two obvious answers to Nintendo fans would be Star Fox 2, and Earthbound 64.
I really love playing the Star Fox 2 BETA and comparing it to the original and Star Fox 64 (which is what it ultimately became), and I'd certainly recommend it to any Star Fox fan. Earthbound 64 never really interested me. Sure it would be fascinating to play through the e3 demo, but even what they had planned for the game wasn't as impressive as the press hyped it up to be.
A fun Nintendo64 game that I recently found a ROM for (and unfortunately, as far as I can tell, only the (E) region has been dumped) was 40 Winks. Is it as fun as all the people on the emulation sites will tell you it is? No. Is it a "should-be classic"? No. But is it fun? Yes, as any adventure fan who had it on the PlayStation will tell you. I wouldn't put it in my top 10 of the N64... most of that is covered by Nintendo and Rare games, but it certainly is as good as 3rd party titles get for the N64.
And if you're a Rareware fan, like I am, you'll probably wish that we had a dump of Twelve Tales: Conker 64 and Dinosaur Planet. I've gotta tell you, it would be nice to have another platformer, and apparently Conker 64 was just about finished when they decided to do a 180 and turn it into the M-rated "Conker's Bad Fur Day".
Dinosaur Planet would have been lovely... I don't know what it is about Rare's graphics on the Nintendo 64, but for some reason, it's even more appealing to me than the graphics in Star Fox Adventures. It looked awesome, and I didn't care for Star Fox Adventures too much (for those of you who don't know: that's what it turned into), so it would be nice to see a ROM of the BETA. Unfortunately, I think it's less likely that we'll get a dump from any of Rareware's titles than it is for us to be getting a dump of something from Nintendo.
Dinosaur Planet had some lovely mp3s released... you ought to check them out if you're a fan of what Rare did on the Nintendo 64.
So what about you guys? What games have you played that were never "released", and which ones do you wish you *could* play?