If you decide to play Undertale, you will definitely meet Sans! It is a skeleton monster you will have to deal with on your way. This antagonist is one of the most dangerous ones, and you will have to struggle a lot to find the right approach to him. Will you choose to defeat him? Then your life is also in danger. Will you choose to talk to him? It will not be easy either. So make sure you do not become a victim of this scary monster. Join now to try different endings – they all depend on your decisions.