
The same (!) cube is shown from three different points of view. What colour is the missing side in the fourth point of view?

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Another fine challenge from Bilbao!
Top image courtesy of Patrick Gage
test
green
Cool puzzle, I think the answer is green, initially thought that it was very tricky and that could be green or yellow but I formed the cubes and the only color that worked for me was green, cool!
Green?
Green
green
It’s the mean green.
Images 2 and 4 tell me that ? is opposite violet.
Images 1 and 3 tell me that yellow is opposite blue and green is oopposite violet.
So the answer is green.
Green
Gotta be green!
If my tired 4a brain hasn’t failed me, it’s that limey green color.
i would have to say the green one….
white
Green
Green !

pink
oops I mean yellow*
Red!
green
purple