Insert them in the Password option from the main menu.

Effect	Password
You have 15,000 tickets, all sections of the slide unlocked, and all secret costumes unlocked	JNSTBSKD
You have 2000 tickets	BBBDBBBD
You have 38170 Tickets, 1 secret costume unlocked	GSFJDBBR
21000 tickets, all dressing rooms	TTTHCSKL
63000 tickets, all dressing rooms	HKLTFSKP