Mario Kart Wii/Unlockables

The unlockables below are listed in the order that they can be optimally unlocked (e.g. by beating all 50CC circuits, and then all 100CC circuits, all 150CC circuits, then all mirrored circuits). Time trial rewards are listed last, but can be completed at any time.

Cups
Each unlockable circuit has to be unlocked separately for 50CC, 100CC, and 150CC.
 * Star Cup: get a silver trophy (second place) or better on Mushroom Cup and Flower Cup.
 * Leaf Cup: get a silver trophy (second place) or better on Shell Cup and Banana Cup.
 * Special Cup: get a silver trophy (second place) or better on Star Cup.
 * Lightning Cup: get a silver trophy (second place) or better on Leaf Cup.

Characters

 * King Boo: get a silver trophy (second place) or better on Mushroom Cup, Flower Cup, Shell Cup, and Banana Cup.
 * Diddy Kong: get a silver trophy (second place) or better on all eight normal 50CC circuits, or complete 450 races.
 * Baby Daisy: get a one star rank or better on all eight normal 50CC circuits, or complete 1,950 races.
 * Dry Bones: get a gold trophy (first place) in the 100CC Leaf Cup.
 * Mii Outfit A: get a gold trophy (first place) in the 100CC Special Cup.

Karts

 * 50CC bikes in 50CC Grand Prix: get a silver trophy (second place) or better on all eight normal 50CC circuits.
 * Super Blooper (medium kart): get a gold trophy (first place) in the 50CC Leaf Cup.
 * Piranha Prowler (heavy kart): get a gold trophy (first place) in the 50CC Special Cup.
 * Cheep Charger : get a one star (or better) rank in all 50CC Cups.
 * Shooting Star (heavy bike): get a gold trophy (first place) in the 100CC Star Cup.
 * Zip Zip (medium bike): get a gold trophy (first place) in the 100CC Lightning Cup.
 * 100CC karts in 100CC Grand Prix: get a silver trophy (second place) or better on all eight normal 100CC circuits.
 * Quacker (small bike): get a gold trophy (first place) in the 150CC Star Cup.
 * Day Tripper (medium kart): get a gold trophy (first place) in the 150CC Leaf Cup.