Mario Kart DS

Unlock Daisy

Take the Gold Trophy in all cups in the Nitro Grand Prix in the 50cc class.

Unlock Dry Bones

Take the Gold Trophy in all cups in the Retro Grand Prix in the 50cc class.

Unlock R.O.B.

(If you know where this guy originated from, a cookie for you!) Take the Gold trophy in all cups in the Mirror Mode Nitro Grand Prix in the 150cc class.

Play as Shy Guy

Play a Download Play game against another player, and Shy Guy can be used, but only for Download Play mode.

Unlock Waluigi

Take the Gold trophy on all cups in the Retro Grand Prix mode in 100cc class.

Extra Karts

Take the Gold Trophy on all cups in the Nitro Grand Prix in the 100cc class to unlock a third kart for all characters.
Take the Gold Trophy on all cups in the Nitro Grand Prix in the 150cc class to unlock a total of seven karts for all characters.
Take the Gold Trophy on all cups in the Retro Grand Prix in the 150cc Mirror class to unlock all karts for all characters.

Unlock Cups

Win a Gold trophy on the Shell Cup and Banana Cup to unlock the Leaf Cup.
Win a Gold trophy on the Leaf Cup to unlock the Lightning Cup.
Win a Gold trophy on the Mushroom Cup and Flower Cup to unlock the Star Cup.
Win a Gold trophy on the Star Cup to unlock the Special Cup for that class.

Unlock 150cc Mirror Mode

Take all the Gold trophies on all cups in the Retro Grand Prix 150cc class.

Unlock Mission Mode: Mission 7

Get a 1 Star or greater rank on each level of missions 1 through 6.

Unlock Alternate Title Screen and Credits

Win all Gold trophies in all cups and classes.

Earn a Star Next to Name

Win all cups in all classes with a 1 Star or greater rank to make a star appear next to your name in multi-player mode and on the "Records" screen.

Unlock Development Team Ghosts

Finish the indicated circuit with a time less than the target to unlock its development team ghost racer.

Nitro Cup: Airship Fortress: 2:10:000
Nitro Cup: Bowser Castle: 2:20:000
Nitro Cup: Cheep Cheep Beach: 1:45:000
Nitro Cup: Delfino Plaza: 1:55:000
Nitro Cup: Desert Hills: 1:35:000
Nitro Cup: DK Pass: 2:15:000
Nitro Cup: Figure-8 Circuit: 1:38:000
Nitro Cup: Luigi's Mansion: 2:00:000
Nitro Cup: Mario Circuit: 1:57:000
Nitro Cup: Peach Gardens: 1:53:000
Nitro Cup: Rainbow Road: 2:17:000
Nitro Cup: Shroom Ridge: 2:06:000
Nitro Cup: Tick-Tock Clock: 1:55:000
Nitro Cup: Walugi Pinabll: 2:24:000
Nitro Cup: Wario Stadium: 2:15:000
Nitro Cup: Yoshi Falls: 0:58:000
Retro Cup: Baby Park: 0:55:000
Retro Cup: Banshee Boardwalk: 2:15:000
Retro Cup: Bowser Castle 2: 1:53:000
Retro Cup: Choco Island 2: 1:02:000
Retro Cup: Choco Mountain: 2:16:000
Retro Cup: Donut Plains 1: 1:09:000
Retro Cup: Frappe Snowland: 2:09:000
Retro Cup: Koopa Beach 2: 0:55:000
Retro Cup: Luigi Circuit: 1:37:000
Retro Cup: Mario Circuit 1: 0:51:000
Retro Cup: Moo Moo Farm: 1:18:000
Retro Cup: Mushroom Bridge: 1:31:000
Retro Cup: Peach Circuit: 1:13:000
Retro Cup: Sky Garden: 1:45:000
Retro Cup: Yoshi Circuit: 1:49:000

Hint for Boost at Race Start

Wait until the number 2 begins to fade, then hold down the A button. But if you press too late, you won't get the boost; too soon, you get a mouth full of exhaust.

Staff Friend Codes

Kevin: 055894384037