The Munchkin Kill-O-Meter allows you to track combat strength during any Munchkin game, including Munchkin Quest, which can be handy since it's easy to lose track of such things in the heat of battle. Each version of the Munchkin Kill-O-Meter includes a two-sided combat counter with which to track your current strength as well as two cards unique to that version. More specifically:

The initial Munchkin Kill-O-Meter includes one card for the standard Munchkin card game and one card for use in Munchkin Quest. Munchkin Zombies Kill-O-Meter includes two cards themed for Munchkin Zombies, while also being usable in any Munchkin game. Munchkin Cthulhu Kill-O-Meter, as you might guess, includes two cards themed for Munchkin Cthulhu.

Munchkin Apocalypse Kill-O-Meter includes eighty-seven, I mean, two cardsthemed for Munchkin Apocalypse.

Munchkin Steampunk Kill-O-Meter comes packaged with, yes, two cards themed for Munchkin Steampunk.

Munchkin Pathfinder Kill-O-Meter comes packaged with Four cards themed for Munchkin Pathfinder. Munchkin Warhammer 40,000 Kill-O-Meter comes packaged with Four cards themed for Munchkin Warhammer 40,000.

Munchkin Warhammer Age of Sigmar Kill-O-Meter comes packaged with Four cards themed for Munchkin Warhammer Age of Sigmar.