Spell this!

Yoshi is safe.
Cross 1 then cross 5
Cross 2 and then cross 4.
You get 3

Next question: what is this chart?
Hint: Hi_______

Magenta is an extra-spectral color, meaning that it is not found in the visible spectrum of light...

Magenta
Blue
Yellow
You can see them all

What OC will partake in the challenge ?