Sonic Ultra 1: Compilation

Sonic Ultra 1: Compilation cheat codes: 
While in 1-Player mode, choose Password from the Game menu.
Type 'golf' in the dialogue that appears.
Click OK. Sonic Golf should start.

While in 1-Player mode, choose Password from the Game menu.
Type 'jhachty' in the dialogue that appears.
Click OK. The last level (the one you can normally only
reach with all the Emeralds) should start.

While in 2-Player mode, choose Password from the Game menu.
Type 'secret' in the dialogue that appears.
Click OK. A secret 2-Player level should start (Hidden Palace).