Here is the making of The Orange Box: (HL2, Portal, etc.) https://www.youtube.com/watch?v=Z8dJ5s9hAuY Making of Doom3 (1999) (4 parts) https://www.youtube.com/watch?v=WvBNQWyziYs https://www.youtube.com/watch?v=rZ3gqzteNEs https://www.youtube.com/watch?v=BmdbETV-MU0 https://www.youtube.com/watch?v=9BMMddTPDec All I can think of right now