After bringing your towns interest level to 100% in any of the six categories you will recieve a message telling you that a special guest will be waiting for you in the hotel. This Uber-Sim will be waiting in the hotel the next day.

Effect - Code

Amazing Daryl - 100% Fun Town
Chancellor Ikara - 100% Tasty Town
Hopper - 100% Cute Town
Mel - 100% Spooky Town
Samurai Bob - 100% Studious Town
Star - 100% Geeky Town