Mario vs Donkey Kong 2: March of the Minis - Jungle Hijinks construction kit

Lava Dome construction kit:
Beat Donkey Kong at Lava Dome.

Magnet Mania construction kit:
Beat Donkey Kong at Magnet Mania.

Mushroom Mayhem construction kit:
Beat Donkey Kong at Mushroom Mayhem.

Pipe Works construction kit:
Beat Donkey Kong at Pipe Works.

Spooky Attic construction kit:
Beat Donkey Kong at Spooky Attic.

Toadstool Castle construction kit:
Beat Donkey Kong at Toadstool Castle.

Tropical Island construction kit:
Beat Donkey Kong at Tropical Island.

Unlock Hidden Basement Bosses:
After beating the game, you get access to the basement area of the building. From here you can unlock two hidden bosses.

Unlockable - How to Unlock:
Hidden Boss 1 - Get 40 Silver Stars
Hidden Boss 2 - Get 40 Gold Stars

Alternate title screen
Get the indicated number of medals for the corresponding minis to appear on the title screen with different music:

Donkey Kong: Get Gold medals on all 80 levels
Princess: Get Silver medals on all 80 levels
Toad: Get Bronze medals on all 80 levels

Basement:
Successfully complete the game to unlock the basement area of the building.

Mini-game bonuses
Successfully complete the indicate number of mini-games to unlock the corresponding Special Construction Kit:

Special Kit 1 Mini-Toad: Successfully complete three mini-games
Special Kit 2 Mini-Peach: Successfully complete six mini-games
Special Kit 3 Mini-DK: Successfully complete nine mini-games

Nintendo WiFi levels:
At the main menu, select "Construction Zone", 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.

Pictures
Successfully complete the indicated task to unlock the corresponding pictures:

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