Okay...for me the best game of the Chiefs 2009 season was the last one against the Donk's at Mile High. A previous committment kept me from watching the Steeler's game, so I can't compare those two.
The worst game for me was the game against the Browns. I was at Arrowhead for that game, and it was the most frustrating game I think I've ever witnessed...for many reasons, too many to mention!
What are your choices for best and worst?