And are you talking about the yen yang Ending??
If so:
1. press the button untill you get the screwdriver
2. Get the penal with the colors down
3. press green red yellow blue
Hope that help you and sorry for my bad inglish!
Btw at the instructions says "GRYB" so ya!
Well in the full version is "GRBB" (green,Red,blue,blue)