In the this game,we have Red light, Blue light and Green light, also have the Red, Blue and Green ray. We need use given mirrors let ray cross light, the light will on with same color ray. So please turn on all of the lights.

Base concept.
Three base color ray: Red, Green and Blue.

White = Red + Green+ Blue.
Yellow =Red+Green
Fuchsia = Red + Blue
Cyan = Blue+Green