No, I'm not talking about the work slowdown currently underway by the kobolds of Stonehell Dungeon. I'm talking about a free skirmish game written by xwardukex over at Fear No Darkness.
FEAR NO DARKNESS:DUNGEON STRIKE is a miniature skirmish game set in the dungeon. Encompassing aspects of the dungeon crawl, board game play, and quick-to-learn mechanics, the players take on the roles of dungeon adventurers running amok in a small delve. Traps springs, monsters lurk, magic awaits discovery, and there's a good chance you'll end up dead. In other words, a perfect old school dungeon crawl.
I got to playtest DUNGEON STRIKE at Retcon a few months back, and it was an utter blast. The game can be completed in an hour or so, making it a great way to kill time when Billy is running late to the game again and keeping everyone waiting. Best of all, it's free! I recommend you check it out by downloading it here.
You'll need some six-siders, a battle mat or dungeon terrain, and some minis, but we all know you've got those hanging around anyway.