Tunnels and Trolls currently sits proudly on its 7th edition, with an extra .5 to iron out the creases. But unlike most other games T&T's editions aren't exactly clear cut, with an unofficial mythical 6th edition, two first editions (UK and US) and decimals stuck on 5th and 7th; there's certainly quite a bit to choose from.
The question is: which one do you play? I've seen a bunch of people subscribing to the neolithic 1st edition rules and one player creating a 4th edition campaign called The Dark Isles. When visiting forums I can see that there's a whole lot of love for 5th edition and even more for an amalgamation of 5th and 7th (which is the one I prefer).
So what do you play? Leave answers in the comment section.