What elements are needed to create a UFO in Doodle God?

To create a UFO in Doodle God, you need to combine two specific elements: Alien and Airplane. First, you must unlock the Alien element, which is part of the Alien group. To create Alien, you need to combine Human and Star. Human is a basic element, and Star can be created by combining Fire and Sky. Once you have Alien, you need to create Airplane. Airplane is made by combining Metal and Bird. Metal is a basic element, and Bird is created by combining Air and Life. After you have both Alien and Airplane, combine them to create the UFO. This combination will unlock the UFO element and help you progress further in the game. Remember to experiment with different combinations and use hints if you get stuck. This strategy will help you advance efficiently and achieve your goals in Doodle God.