From: PartOfYourWorld | #043
One of these days, I'm gonna try to get a (North American) complete N64 collection. It's not nearly as insane to pull off as for Nintendo's older consoles (only about 350 N64 games were released in NA compared to 700+ for NES and SNES). Plus, I don't think the N64 has any super rare games for which I'll have to shell out hundreds, and it's my favorite and most nostalgic system.
http://www.rarityguide.com/n64_view.php
According to this, the rarest games are Bomberman 64 Second Attack and Worms Armageddon. Transformers Beast Wars Transmetals also seems to go for quite a bit. But yeah there's no "only 12 ever made" special cartridges, or any "recalled and none are known to exist" games like Stadium Events.
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Black Turtle spilled my diet soda!