Your objective is to find the Talisman and any other treasure that remains. The search will be long and difficult, and even if you succeed you must find your way back to the gate and somehow return through it to complete your task.
The author produced and released a rewritten and expanded version of the game for RISC OS in 2023.
[+] Users who have solved this game
I think this has been misclassified - none of it is in Basic except for a brief loader file.
Yes, this seems to be a machine-code game, *not* BASIC.
This is excellent news. I play tested Derek's new Risc version of Mirror of Khoronz (the sequel to Gateway To Karos) and I am looking forward to tackling this in a few days time. Incidentally I can thoroughly recommend Mirror as a great game that runs very nicely in RPCEmu, an Archimedes emulator.
I am making some decent progress with Derek's new Archimedes version. There have been few bugs to report and the backdrop of the story and the geography are compelling indeed. As it weighs in at over 300 locations I am taking my time. The NPC interaction is excellent here too.
I have finished playtesting this magnum opus and have uploaded the new expanded map and review to CASA. The latest version of the game will be on Derek's web site. This is one of the best text adventures I have ever had the pleasure to play. It is well worth downloading the RPCEmu emulator to play it on.