The Fantasy Trip, Melee, and Wizard are among the first games designed by Steve Jackson of Steve Jackson Games. They fairly rule lite using 3d6 (roll low) to resolve combat and magic. It is also one of the first line of games to straddle the line between RPGs and Wargames. Melee and Wizard are two standalone wargames. Melee focuses on a quick system to resolving melee fights between combatants. While Wizards focuses on magical duels with spells.
Into the Labyrinth combines and extends these wargames into a complete RPG known as the Fantasy Trip using Advanced Melee and Advanced Wizard to handle combat and magic along with additional rules like talents.
It was originally published by Metagaming but went out of print when the company went under in the early 1980s. US copyright laws allows authors after several decades (30+ years in this case) to recover copyright to their work. Steve Jackson took advantage of this provision to acquire the rights to the original rules of the Fantasy Trip along with the right to other parts of the line he wrote like Tollenkar's Lair, and the two Death Test solo adventures.
Now Steve Jackson Games has launched a kickstarter to get all three games including Tollenkar's Lair back in print.