Color changing characters, trading, and a little bit of fighting. That and YouTuber Chasming's take on Team Fortress 2 pretty much sums up the game and all its madness accurately.
It is a submission for Valve's annual Saxxy Awards—a contest held for the Source Filmmaker community—which is just around the corner.
SFM TF2 in 60 seconds (Saxxy Awards 2014) [YouTube]
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