Rareware, the N64 era. Though I like them in previous eras too for stuff like Donkey Kong Country, Battletoads and Jetpac.
The 6th and 7th gen were promising, too bad they were sabotaged my Nintendo and multiple times by Microsoft.
Oh well, at least they got to make the hottest waifu ever.
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If you ask me, the N64 almost owes its success to Rare entirely. MS are fools for not making use of their clout and experience.