Fox also stated that he had been working on the project since 2012, and that the idea for Undertale developed from Deltarune during production. On November 1, Fox shared more details regarding the game, including that the rest of the chapters were expected to release simultaneously, but work had not yet started, and there was no estimated timeframe for completion. The following day, Fox released the first chapter of the followup to Undertale, named Deltarune, for free under the guise of a 'survey'. On October 30, 2018, Fox tweeted a request for fans of Undertale to check the game's official Twitter account in 24 hours. Ultimate as a Mii costume available through downloadable content, along with his instrumental composition 'MEGALOVANIA', for which Fox provided a new arrangement. Sans, a character from Undertale, was later included in Super Smash Bros. creator Masahiro Sakurai at his home, where they discussed the series and played Super Smash Bros. The success of Undertale, especially in Japan, afforded Fox the opportunity to visit Super Smash Bros. Fox was then chosen to be part of the 2018 Games Forbes 30 Under 30 list for his role in creating Undertale. He also became a contributor to the A Profound Waste of Time magazine. In 2016, Fox released a number of unused musical tracks from Undertale. Despite Undertale 's awards and widespread acclaim, Fox wrote that his personal opinion was that the game was still 'niche' and deserved an '8/10' review score. Fox commented that he did not mind if people stated that they did not like the game, saying that it was 'not for everyone'. įollowing its release, Undertale garnered an extensive fanbase. He thought of the character designs and ideas for Undertale while in college, where he drew them in his notebook. He had some experience in game development before Undertale, using RPG Maker 2000 with his three brothers to make role-playing games and EarthBound ROM hacks in high school, the most notable of which was Earthbound: The Halloween Hack. Fox worked on the entire game independently, besides the art assets-which he asked Temmie (Tuyoki) Chang to help with-to avoid relying on others.

The game sold more than 1 million copies, becoming a 'breakout hit' and ' pop-culture phenomenon'.

Fox's most well-known work is the 2015 role-playing video game Undertale, which he also composed the soundtrack for.

How to make your own megalovania