Tunnels & Trolls is the only game system I can think of that you have to be specific about the TYPE of adventures you are referring to. There is a real dearth of available adventure for a GM to run a party thru, which is probably why many (including myself for the longest time) think of Tunnels & Trolls as a SOLO play system - either in total or nearly so.
There are party driven adventures out there for T&T, you just need to look for them a bit harder then you might for a D&D clone.
Where might you find those elusive GM Adventures for Tunnels & Trolls? At the Hobgoblin's Tavern, AR Holmes Proprietor (no relationship to Tenkar's Tavern - just sayin'). There are about 20 free to download GM adventures on the site (and a number of not free but very well done solos). So you have a campaign or two worth of adventures on just this one site (I am actively searching for more).
The Space Gamer #83 -
3 hours ago