It lasts six hours and is very replayable. You are looking at a great small role playing game with mechanics and stories that will affect you emotionally, and not the way you would expect it to. It is difficult to be more specific about the virtues of Undertale without spoiling the surprises for you. And let us not forget its unexpected ending. But if you dig in a bit you will find scenes that will make you cry or shudder. On the surface it seems like a friendly game with an odd sense of humor. Undertale is very reminiscent of Earthbound, Nintendo's role playing saga.
We cannot be more precise about this, but many of the surprises that await you in this game are similar to the battles against Psycho Mantis in Metal Gear Solid, or the duel against the Scarecrow in Batman Arkham Asylum. Ports of Basilisk II are available for Mac OS X, Windows, Linux and a number of lesser known systems. Undertale breaks the fourth wall over and over to affect you, the player. be careful: the game records your previous decisions and 'reminds' you of them when you start over. Will you be a good person or a butcher? But. Since Undertale lasts six hours, you can replay it as often as you can to see the different alternatives. Your decisions will affect the story in an umpredictable way, certain characters will become your allies.
An Undertale game changes thanks to this option of sparing the life of others.