Yep, its Tunnel & Trolls Tuesday here at the Tavern. To start everyone off on an even foot, I'm going to direct you to a free download of the Tunnels & Trolls Rulebook (abridged 5.5 version)
Now head over to the Free Dungeons Website. This is a troll's heaven. Another free version of the rules can be found, character sheets, and adventures (automated even). Yep, you can play solo on your computer. You don't even have to break out any dice (tho you will want to when you move on to other dungeons).
Rinse. Repeat. Enjoy.