Sonic CD (šifre)

Sonic CD

Level Select
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At the title screen, it says "Start game". 
Don't press enter. 

Instead, press Up, Down, Down, Left, Right, and Jump. 
It will take you to the level select. There you'll see 
two numbers and a letter. The first number represents 
which zone. (e.g. Palmtree Panic, Collision Chaos). 
The second number represents wehich act, like 1, 2 or 3. 
The letter represents time: A=Present B=Past C=Good Future 
D=Bad Future.