You've come to our website, which offers answers for the Brain Test 4 game. This webpage with Brain Test 4 Doctor Worry needs to get blood samples from that fly 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.
Your finger might attract the fly. Keep your finger on the screen until the fly is filled with blood. Use the swatter to kill it.