It was also ported to Linux in July 2016, PlayStation 4 and PlayStation Vita in August 2017, and the Nintendo Switch in September 2018. The game was released for Microsoft Windows and OS X in September 2015. However, development was delayed over the next three years. Originally, Undertale was meant to be two hours in length and was set to be released in mid-2014. These include the Mother and Mario & Luigi role-playing series, the bullet hell shooter series Touhou Project, and the British comedy show Mr. The game took inspiration from several sources. Outside of some artwork, Fox developed the entirety of the game by himself, including the script and music. These choices affect the game, with the dialogue, characters, and story changing based on outcomes. They can opt to pacify or subdue monsters in order to spare them instead of killing them.

The combat system involves the player navigating through mini-bullet hell attacks by the opponent. Some monsters might engage the player in a fight. The player meets various monsters during the journey back to the surface. The player controls a child who has fallen into the Underground: a large, secluded region under the surface of the Earth, separated by a magic barrier. Undertale is a role-playing video game created by indie developer Toby Fox.

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