Rumor has it that during the Cold War, in 1970-s, the CIA was concerned that there might be Russian spies in its ranks.
The CIA psychologists designed an ingenious test that would show who knows Russian or any other foreign language, but does not admit it. The test was simple. They would show a paper card like this and ask to read out loud the colors the person sees.
It is easy to do if you do not know the language. But for a person who understands the card language it is impossible to read our colors without pauses, mistakes, and hesitation.
Try it in English:
The Brain Screw Game uses the same principle. Just answer the questions as fast as you can, and in the end we will try to guess something about you.
Or just play for a high score. This is probably the only place where knowing multiple languages might hurt your scores :)