Mario Kart DS / Codes and Secrets

Unlockable Characters
Dry Bones - Get a Gold Trophy on every cup in Nitro Grand Prix on 50cc.

Daisy - Get a Gold Trophy on every cup in Retro Grand Prix on 50cc.

Waluigi - Get a Gold Trophy on every cup in Retro Grand Prix on 100cc.

R.O.B. - Finish 150cc Mirror Mode Retro Grand Prix with Gold Trophies on all cups.

Unlockable Karts
3rd kart for all drivers - Get a Gold Trophy on every cup in Nitro Grand Prix on 100cc.

7 karts available for each driver - Get a gold trophy in every cup in Nitro Grand Prix on 150cc.

Any kart for any character - Get a gold trophy in every cup in Retro Grand Prix on 150cc mirror.

Unlockable Cups
Leaf Cup - Get Gold on Shell Cup and Banana Cup.

Lightning Cup - Get Gold on Leaf Cup.

Special Cup - Get Gold on Star Cup.

Star Cup - Get Gold on Mushroom Cup and Flower Cup.

Other Unlockables
Mission 7 in 'Mission Mode' - Get at least a 1-star ranking on all levels of every mission in Mission Levels 1-6.

150cc Mirror Mode - Finish 150cc Retro Class with Gold trophies on every cup.

Alternate Title Screen - Finish all classes with gold trophies on all cups.

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