From Board Game Geek:
"Kill the monsters - Steal the treasure - Stab your buddy" "Munchkin" is a stand-alone card game designed by Steve Jackson that "simulates" (well, sorta') a fantasy-themed RPG (oh, ok, D&D) in a simple, card-based game that's chock full o' silliness. Everyone begins the game as a 1st level Human with NO Class (heh-heh) and via cards, they acquire Races (Elf, Dwarf, etc.), Classes (Thief, Wizard, Cleric, etc.), Items, Armor, Potions and more that they use to combat hideous monsters like the 4th level Undead Horse, the 10th level Net Troll and the 14th Level Unspeakably Awful, Indescribable Horror (very nasty, indeed). The object of the game is to reach Level 10 and levels are acquired via the slaying of monsters and the selling of acquired treasure (1,000 Gold Pieces equals 1 Level). Very silly and a lot of fun!