- Valve asks Portal 64 developer to cease project following Nintendo concerns Eurogamer.net
- That Portal 64 demake we liked so much has been kiboshed by Valve: ‘They have asked me to take the project down,’ creator says PC Gamer
- As Team Fortress 2 and Portal fan games are hit with copyright requests, acclaimed sandbox game dev behind Garry’s Mod says the decision is “hardly surprising” Gamesradar
- Valve squashes Team Fortress 2 and Portal fan projects after years of leniency Engadget
- ‘Save Team Fortress 2’ campaign explodes after Valve DMCAs fan remake PCGamesN
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