With the circumstances around it's development, I think Majora's Mask is the

Board 8

Mac Arrowny posted...
If we're talking Nintendo games, Super Metroid was made in under a year by a team of 23 people. Much more impressive IMO.

Is that really so unusual for the time period, though? The number of people seems fairly normal, and "about a year" sounds like a normal-ish amount of dev time.
Congrats to 2020 GotD Guru champ azuarc!