Just some more votes for underrated games that I absolutely loved as a kid:
Addams Family
UN Squadron
Sim Ant
Sim City
NBA Jam
Death and Return of Superman
Secret of Mana
Legend of Zelda: A Link to the Past
Super Game Boy (does that count??)
Super Bomber man
Vegas Stakes
And don't forget there's the brand new Star Fox 2 manual with all new illustrations. Also included here is the full Earth Bound players guide that originally came with the game.