It all started off as a puzzle game called "Teepop". The inspiration was the Japanese game "Puyo puyo"! Teepop was released on August 2004 (I think it wasn't a public release)
The game however continued to develop and it undergone some major changes and became "Teewars" in 2007. You all probably now how it looked like: It's only official game type was DM and it looked a little different in terms of graphics... Anyway it had a grand public release which was 0.2.0 
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On March 2008 when Teewars got to version 0.4.0 it changed it's name to "Teeworlds" due to unknown legal reasons.
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And as for the developers:
The whole idea came from the "you know who" -Magnus Auvinen! Now I don't know much about their side of the story only that they met in Sweden pre 0.1.0. Developers by group: Serp;Void;Red com;Maikka;Datag.
Developers by tittle: Somerunce(Moderator);Matricks;Teetow;Magnet;Landil(Administrators) .
-The End
