Mario vs. Donkey Kong 2: March Of The Minis Codes -

Jungle Hijinks Construction Kit:
Defeat Donkey Kong at Jungle Hijinks.

Lava Dome Construction Kit:
Defeat Donkey Kong at Lava Dome.

Magnet Mania Construction Kit:
Defeat Donkey Kong at Magnet Mania.

Mini-DK Special Construction Kit:
Successfully complete nine mini-games.

Mini-Peach Special Construction Kit:
Successfully complete six mini-games.

Mini-Toad Special Construction Kit:
Successfully complete three mini-games. Beat Three of the Minigames

Mushroom Mayhem Construction Kit:
Defeat Donkey Kong at Mushroom Mayhem.

Pipe Works Construction Kit:
Defeat Donkey Kong at Pipe Works.

Shy Guy Smash mini-game:
Collect the hidden card in every level of a world to spell "MINIMARIO". Note: The layout of the Shy Guy Smash mini-game varies from world to world.

Spooky Attic Construction Kit:
Defeat Donkey Kong at Spooky Attic.

Toadstool Castle Construction Kit:
Defeat Donkey Kong at Toadstool Castle.

Tropical Island Construction Kit:
Defeat Donkey Kong at Tropical Island.

Hidden Boss 1:
Successfully complete the game with 40 Silver Stars. The Boss is in the basement of the building.

Hidden Boss 2:
Successfully complete the game with 40 Gold Stars. The Boss is in the basement of the building.

Nintendo WiFi levels:
Select "Construction Zone" at the at the main menu. Then, select "WiFi Connection", followed by "Receive". Select an open spot, "Receive", then the Nintendo logo. You can now access the WiFi levels without a Friend code.

Alternate title screen:
Complete the indicated task to have the corresponding minis appear on the title screen. Note: This will also change the background music.

Donkey Kong Minis: Get a "Gold" rank on every level. 
Princess Minis: Get a "Silver" rank on every level. 
Toad Minis: Get a "Bronze" rank on every level. 

Movies:
Complete the indicated task to unlock the corresponding movie.

Introduction: Available at start. 
Ending: Defeat the final boss in the roof. 
Musical: Defeated hidden Boss 2 (B2) in the basement. 

Pictures:
Complete the indicated task to unlock the corresponding pictures.

Pictures 1 and 2: Defeat DK in floor 1. 
Pictures 3 and 4: Defeat DK in floor 2. 
Pictures 5 and 6: Defeat DK in floor 3. 
Pictures 7 and 8: Defeat DK in floor 4. 
Pictures 9 and 10: Defeat DK in floor 5. 
Pictures 11 and 12: Defeat DK in floor 6. 
Pictures 13 and 14: Defeat DK in floor 7. 
Pictures 15 and 16: Defeat DK in floor 8. 
Picture 17: Defeat DK on the roof. 
Picture 18: Defeat Hidden Boss 1(B1) in the basement.