For general feedback about the game.Steam Support
Visit the support site for any issues you may be having with the game or Steam.
Attention all Wizards, Witches, and Mad Scientists! Welcome to Particle Mayhem! Your time to shine is now, and Particle Mayhem wants the best Unusual particles and protective clothing!
Particle Mayhem is a brand new TF2 community event and contest where content creators can come together and make crazed Unusual effects, wacky cosmetics, and dangerous experiments that may or may not harm another living being.
Visit the Project Mayhem website for more information!