Play as Bowser- At the main menu Press Up, C-Down, C-Up, Down, then the screen will shake and he will be on the character select screen.
Unlock Bowser Land- To unlock Bowser land, just play each adventure board 1 time. Then, when you go to the main menu, you will see Toad being kidnapped. You can now play at Bowser Land.
Dungeon Dash Mini Game- Beat Bowser Land and go to the mini game park. There the Pirranna Plant will give you dungeon dash.
Coaster Mini Game- Buy all the mini games from Woody and you will get the mini game Coaster.
Drivers ED Mini Game- Buy every mini-game including Item and Battle Mini-games.
Rainbow Run Mini Game- Beat easy and normal mode in mini-game coaster.
Buy Item Mini-games from Woody- Beat Normal mode in Mini-game coaster.