This is another of TSR's Endless Quest Gamebooks. Besides stories based on DnD, they also had some based on their other systems, like "Gamma World" and "Star Frontiers", and licensed properties like "Tarzan" and "Conan"

This one of two Tarzan ...

Tower of the Sorceror is a topdown RPG/ Puzzle hybrid, ported from the Dos version by Jeremy Gibson. Its incomplete as the Dos version had 50 levels and this one only 10. Its free to play with no registration required.

His website is gone but ...