To have an access to Mini-games at Tingle's Tower you should bring two or more players to a completed level, or complete the second stage of a level with two or more players.
World 1: Bucking Bronco
World 2: Cucco Wrangling
World 3: Hammer Tag
World 4: Monster Hunting
World 5: Volley, by Golly
World 6: Mole Melee
World 7: Monster Hunting Returns
World 8: Bonus Level