Last Updated: July 29, 2014.
Nausea is the first of the Krust-O-Meter ratings. (For more information about the Krust-O-Meter, see here. For more information about the other Krust-O-Meter ratings and other technical details in the game, see here.)
10 points of Nausea gets you 1 star, 20 points gives 2 stars, 40 points 3 stars, 60 points 4 stars, and 70 points 5 stars. It is the easiest of the ratings to maximize as every ride you build adds 10 points to the rating, plus there is one decoration which adds 5 points.
Which rides count towards the Nausea rating?
Regular Rides (8): Death Drop, Radioactive Man: The Ride, Wet And Smokey Stunt Show, Krusty’s Haunted Condo, Scratchy’s Flea Dipper, Viking Boat Ride, The Tooth Chipper, Krusty’s Giant Wheel
Premium Rides (3): Eyeballs Of Death, Mt. Krustmore, Unoriginal Log Ride
Limited-time (no longer available) (3): Twirl ‘N’ Hurl, Happy Elves Ride, Tunnel of Love
One Nauseating decoration was added with the Krustlyand 2 update, the Duff Beer Fountain. It provides 5 Nausea points.