The most popular Counter-Strike maps of all time (de_dust and dust2) were visual copies of a map from a trailer for TF2, and were released in 2000. TF2 finally

The most popular Counter-Strike maps of all time (de_dust and dust2) were visual copies of a map from a trailer for TF2, and were released in 2000. TF2 finally came out in 2007, sporting a completely different look.