The Fireman bonus round rule is one of the many rules that can be applied during the Bonus Round episodes. It can be offered on any floor for any character but is more likely upon entering floors 2 or 3. The rule cannot appear at the same time as the Snowman or Baby Squid Bonus Round rules.
When the rule activates, the player will be inflicted with 1 Burn at the start of each turn, meaning that one dice will be set on fire, which will cost health to extinguish.