A fantastic, weird gonzo exploration into the deeps. This module is an imaginative romp through a mysterious and evocative underworld setting filled with giant chaos godlings and remnants of advanced beetle civilizations. This module will tick all the right boxes for those who love a humurous gonzo themed adventure, but may not appeal so much to those who prefer a grittier, more 'serious' style of play. The only issues with this module are the layout and presentation of information which at times is not logical or helpful for the GM when running at the table. Information should be provided in a logical manner that assists with quick scanning during play, this module at times fails on this point. Other than this, this is a solid module and should not be missed by any lover of OSR systems. 4 out of 5.

This is a great dungeon crawl into the depths. It has the weird sci-fantasy gonzoness that hits just the right spot. Info is given on the factions players will encounter. The monsters are great, as is a lot of the artwork.

I loved running this adventure. A lot of interesting characters and ton of awesome material. Such a breath of fresh air from most adventures. Strongly recommend the players guide as well.

Book has a ton of art with wacky flavour that made the adventure very memorable. I cannot recommend this enough.

Loved this. Absolutely worth the softcover for the graphics alone. Even if you never run the adventure with the characters provided, it is filled with ideas which can be adapted to any game system. Worth the money.

Brilliant! Baffling! Bizarre! Utterly confounding. Just the most amazing coagulation of weirdness I've seen in a long time. Perhaps the best thing about it is the complete lack of predictable OSR vermin. Not a Goblin Fight to be seen! EVERYthing is nonstandard, unique, or just too damn strange to be dealt with the Usual Way. Unique creatures, civilizations, and locales. Makes for incredible fun just reading. MUST find out how it runs. While the presentation leans toward the gonzo and humorously bizarre, it would be very, very easy to run it with a darker than darkly dark grim Lovecraftian tone. I want to see more of this Underground setting. I want to send Player Characters drifting on the Black Ooze River on an ill-advised mission of Corsair mayhem. I can barely wait to write my own adventures in this setting, after enough tasty beverages to get into the appropriate mind-set. In short... I have to kind of recommend it. Lots of fun with endless applications. ALL HAIL SHAGGATH KA THE WORM SULTAN. and stuff.

Like all of this publisher's previous offerings, Operation Unfathomable is a work of pure, inspired, genius that boasts excellent words and similarly excellent editing (something I'm a bit of a stickler for). The artwork, the layout, the tools, and the adventure itself are all brilliant! Designed to be played at cons, Operation Unfathomable allows 1st-level characters to experience epic dungeon questing usually reserved for high-level parties (it even comes complete with some very colorful pre-gen characters that can be used as PCs or a rival party of adventurers). It's designed for Swords & Wizardry Core, but I'll probably be running it with Swords & Wizardry Continual Light and as a kind of tabletop rogue-like. I'm very excited about it!