South Park: Chef's Luv Shack

Hint: Spank The Monkey mini-game:
In the Spank The Monkey game, notice that the monkey's butts become red when Mr. Mackey hits them, and become redder every time they are hit. If you forget the pattern, watch the order that the butts turn back to normal.
Information in this section was contributed by AskPete.

Hint: Better variety of mini-games:
Play as Cartman if you want a better variety of mini-games. He is the only character that can play the Rodeo and Beefcake mini-games.
Information in this section was contributed by AskPete.

Hint: Beefcake bonus:
Eat every single can of Weight Gain 4000 in the Beefcake mini-game to see a bonus animation at the end.
Information in this section was contributed by AskPete.