This early (original number 9) Fighting Fantasy is a classic set in the FF world of Titan and very much immersed in the fantasy world, with elves, dwarves, vampires, wolves, zombies, dragons, demons, orcs, goblins and golems - as well as some weird and wonderful additions such as a squid-like Brain Slayer and some evil Bird Men. Plot-wise it's basic but has a definite story where the hero enters and escapes from the Snow Witch's lair. The setting is broadly arctic (like Caverns of Kalte) but the last part of the adventure inexplicably switches to mainland Titan.
My first criticism of this book is that its structure is extremely linear - there is basically one path from beginning to end, and the route choices nearly always involve a path continuation or a detour to a side-room from which one must return to the main course. This makes for a long (maybe over-long) adventure, a lack of challenge in terms of route choices and a reading experience resembling a novel more than an adventure.
Second, it's very, very hard to defeat. Not in the interesting sense of having to solve puzzles of which is the best route or which items are needed. In the sense of having a frustrating number of lethal luck, skill and stamina tests and unavoidable high level (skill 10 to 12) adversaries. A few pages from the start and you're already fighting a skill 10 or 11 Yeti and facing a potentially lethal avalanche. Later you'll have to beat a Skill 12 Bird Man - combat is unavoidable. And these are the routine encounters - not the "boss" monsters. It's not difficult to use up your Luck and Provisions before you even meet the Snow Queen, rendering the later battles deadly.
Third, it's the conversion of a shorter piece into a book-length adventure, and it tells - the main quest (defeating the Snow Witch) is already done a third of the way in. It's like one of those films which carries on for half an hour after it "ends". Two-thirds of the book is anticlimax. And the difficulty level seems geared to the shorter adventure.
In all, overly hard, far too linear and lacking in immersive elements to keep interest - not one of the strongest of the series.