Does Defeating 2 Monsters Mean 2 Levels?

[MunchkinMan]

To point out the rule which confirms this, under Rewards:

Originally Posted by The Rules

When you kill a monster, you get one level per monster, unless the Monster card says something else[.]

If you're in a combat with 2 Monsters and your combat strength is greater than the combat strength of both Monsters, then you've killed two Monsters, and for each Monster you get the rewards as described in that section.