You've come to our website, which offers answers for the Brain Test 4 game. This webpage with Brain Test 4 What is that Martian hiding answers is the only source you need to quickly skip the challenging level. This game is made by developer Unico Studio, who except Brain Test 4 has also other wonderful and puzzling games.
Check out his body. That line on his forehead might be something interesting. Poke at his forehead with that stick.