Undertale is a Role-Playing Game by Toby Fox, released on September 15th, 2015. It tells the story of a young child who investigates a mountainside cavern and falls down a deep hole, awakening on a bed of flowers in a dark and mysterious place. Now the child must find a way back home, encountering all manner of creatures along the way.
Undertale draws heavily from Earthbound and Mother 3, but instead of using statistical values to resolve enemy attacks, battles play out more like a Bullet Hell game where you must dodge enemy projectiles and protect the heart-shaped avatar representing your SOUL. The game changes significantly depending on how you deal with the monsters you encounter: you can fight and defeat them as normal to earn LOVE (LV) and EXP, or figure out how to befriend and show them mercy.
Long ago, two races ruled over the Earth: HUMANS and MONSTERS. One day, war broke out between the two races. After a long battle, the humans were victorious. They sealed the monsters underground with a magic spell. Many years later… Legends say that those who climb the mountain never return