Munchkin has been around for a long time now, but it's still a mainstay of our game nights. Imagine playing a game of D&D where everyone only cares about maxing out their characters and you will have some idea of how to play. The goal is to level up to level 10 by defeating monsters and collecting loot. You do this by using your loot to make your character as powerful as possible, or by asking others to help. They won't always help, but that's part of the fun.
Because Munchkin is such a beloved game, a huge number of add-ons take the game from a 30- to 45-minute game up to several hours of monster-killing fun, and all of it is played only with cards. It's truly a great time had by all.