Undertale is a role-playing video game created by American indie developer Toby Fox. The player controls a human child who has fallen into the Underground, a large, secluded region underneath the surface of the Earth, separated by a magic barrier. The player meets various monsters during their journey, some of which they must battle. The player has the option to spare or kill the monsters, with the latter choice typically leading to a more difficult fight. If the player kills a sufficient number of monsters, they are given the opportunity to fight a powerful monster known as a "Boss."

Undertale is considered a spiritual successor to the Mother series, of which Fox was a major fan growing up. The game incorporates meta-humor and references to popular culture. Undertale was released for Microsoft Windows and OS X on September 15, 2015, then later for Linux on July 17, 2016. The game received critical acclaim, with praise particularly directed at its writing, characters, and humor. It was nominated for multiple Year-End Game of the Year awards, and won several, including IGN's Game of the Year.

Undertale is a work of art. It's a game that understands what makes us tick, and it tells a story that will stay with you long after the credits have rolled. It's a game that will make you laugh and cry, sometimes in the space of a few minutes. And it's a game that will leave you thinking about its characters and its world long after you're finished with it. In a year overflowing with great games, Undertale is a true standout. It's a smart, funny, and moving experience that everyone should play. Undertale is one of the most important games of the past few years, and it's one that I'll remember and cherish for a long time to come.

Step-by-Step Guide How to Play Undertale

1. Create a new game or load an existing save.
2. Enter the menu and choose "Act" to start a new fight.
3. Select your team of monsters and choose their attacks.
4. Watch the battle unfold and use items to help your monsters win.
5. After the battle, you'll be given the option to spare or kill your opponent.
6. Continue playing through the story, making choices that will affect the outcome of the game.