The only confirmed bastard of the 9 mercs.

The facility built sometime between 1850 and 1890

The corpse the Mercenaries find in "A Cold Day in Hell"

The Soldier secondary introduced in the Dr. Grordbort's Victory Pack Patch

The Engineer hat that references the Day of the Dead

The original Pyro, during the first Gravel War.

The map that can be played on Arena mode, CTF mode, and Control Points mode

The mercenary who traveled back in time to warn the others about the robot crates, in "Death of a Salesbot"

The Medi gun incorrectly shown to give Uber in the Meet The Medic video.

The Heavy hat that shares the same texture as the umbrella from the Rancho Relaxo

The fake 10th class created by the community, that Valve referenced.

The halloween map with mutliple toy trains hidden around it.

The comic that first introduced the Heavy vs Pyro War.

The objectively best Demoman Primary

The hat named after the main nutritional element it's made up of.

The only merc to work in the House Cleaning industry outside of his regular mercenary job.

The only map with an inspawn hidden room that can be accessed by players

The class who was revealed to have had an origin story similar to Superman, in the comic "Blood in the Water"

The only melee weapon specifically designed to "Lend a hand"

The Scout's Furry Feet

The two classes who share the same voice actor, Gary Schwartz.

The map was first shown in the background of the Huntsman update page

The specific kind of monkey Poopy Joe is suspected to be

The weapon originally designed to be used by Pyro, before being changed to be used by other classes

The best hat