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Probably Instant Web Hit? Possibly and/or Sleeper Hit, if the game was around for a while before going viral, or just if the uptake was slow and steady rather than overnight. Could also be a creator's Breakthrough Hit, but that's about a work being the point when a creator's career really takes off, not so much how long the game took in finding its audience or how its word of mouth/memetic status spread. Many of these might fit all three.
Edited by UnsungPossibly also the result of a Colbert Bump.
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An Indie Game that goes viral across the Internet over a certain year. Due to the challenges indie games face compared to those made by big studios, with them often coming from entirely unknown creators (only two of the games on this list, Deltarune and Among Us, actually received popularity due their creator's prior works) its rise to popularity is often contingent on it garnering a small but dedicated fanbase, and then fanworks such as memes and Filk Songs, as well as big streamers playing the game, help it reach a wider audience, until it ultimately goes viral.
Examples include:
- Cave Story: Probably the Ur-Example. (2004)
- Minecraft: Probably the Trope Maker. (2009-2014, prior to being purchased by Microsoft and no longer being an indie game)
- Five Nights At Freddys: Probably the Trope Codifier. (2014-present)
- Undertale (2015-2016)
- Bendy and the Ink Machine (2017-2018)
- Cuphead (2017)
- Doki Doki Literature Club! (2017)
- Baldi's Basics in Education and Learning (2018)
- Deltarune (2018)
- Fall Guys: Ultimate Knockout (2020)
- Henry Stickmin Series (2020)
- Among Us (2020-present)
- Friday Night Funkin' (2020-present)
Edited by geekgecko