Undertale is a roleplaying game where you have choices, unlike most games. There are three main ways to play; Pacifist where you kill nothing, Neutral where you kill some things, and genocide when you kill them all. The monsters will react to you differently depending on what you do, and you'll even have to battle different bosses. You can tell that a lot of heart was put into this game, too. All the characters have realistic personalities, and makes you feel bad that they are trapped. The soundtrack brings a lot to the game too. In order to progress, you must win a battle, either by sparing or killing the monster. You also have to solve simple puzzles. The battles are challenging, and can keep you going for weeks. The fandom, however, can poison your experiace, so be careful what you search.