Kirby: Canvas Curse

Unlock bonus characters:
Insert Kirby And The Amazing Mirror GBA game into cartridge slot.
Load back a saved game from it.

or

Finish Kirby: Canvas Curse with the GBA game
Kirby's Nightmare In Dream Land in the cartridge.

Unlock Waddle Dee, Buy King Dee Dee (buy for 20 metals):
Finish the game once

Unlock Metaknight (buy for 25 medals):
Buy King Dee Dee Dee to

Unlock Waddle Doo
Finish the game with the following characters:
Kirby, Waddle Dee, King Dee Dee Dee, Metaknight

Unlock Medal Swap extras:
Get the indicated number of medals:

Medal swap - Number of medals:
Bead Line: 6
Course 1-8: 9
King Dedede: 20
Life Boost: 12
Life Boost: 14
Life Boost: 7
Meta Knight: 25
Song One: 3
Song Three: 3
Song Two: 3 -
Tropic Line: 6
Zebra Line: 6

Change title screen:
Finish the game with 100&#37 completion

Unlock extra sound tracks:
Play as kirby and finish the World of Drawcia level

Track number - Title:
24 - The World of Drawcia
40 - Drawcia Demo
41 - Dracia Sorceress
42 - Drawcia Soul
43 - Ending Cinema
44 - Credits

Unlock Block Attack minigame:
Finish Block Attack level two in Boss Games.

Unlock Cart Run minigame:
Finish level two of Cart Run in Boss Games.

Unlock Paint Panic minigame:
Finish level two of Paint Panic in Boss Games.

Unlock Jump minigame:
Finsh the game with all 5 characters