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Thunderdome is an internal event where Riot's split up into teams to work on whatever sort of project they can imagine. A hackathon event run at Riot every so often, Rioters are given about 3 days to create a project that they're passionate about. This is everything from new maps/gamemodes to internal tools that we think could help make a Rioter's life easier.
Lots of the stuff seen at Thunderdome never sees the public, but some things are iterated on for actual public release. This is all about working on cool projects for players and for Rioters.
It's intended to help explain a cool part of working at Riot for those that are going through the application process.
One of the many things that came out from this event is the well known
ARAM game mode for the Proving Grounds, and later, the Howling Abyss and Butcher's Bridge maps.
List of known games made during Thunderdomes:
(2017)  Jam Packed (Riot Thunderdome Mini-Games) (2018)
Ziggs Arcade Blast Trailer
Thunderdome 2017: Demacia Vice Squad
Demacia Vice Squad Promo 1
Demacia Vice Squad Promo 2
Demacia Vice Squad Promo 3
Thunderdome 2017: Super Arcade Gunners
Thunderdome 2017: Ziggs Arcade Blast
Thunderdome 2017: Ziggs Arcade Blast Concept (by Riot Artist
Thunderdome 2018: Jam Packed 1
Thunderdome 2018: Jam Packed 2
Thunderdome 2018: Jam Packed 3
Thunderdome 2018: PROJECT.EXEcute
Thunderdome 2018: Star Guardian Insomnia
Thunderdome 2018: Super Zac Ball