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Now believe it or not this isn't actually a half bad dungeon and it can be used with all kinds of OSR or retroclone systems. There are actually all kinds of possibilities for this fun house dungeon and what we're talking about here is straight up oh my God weirdness right off the bat. This entire dungeon's basis is in the DM's hands literally.
This is not a dungeon to be taken seriously at all or is it? This is a dungeon with turnstile blocking the passage to enter, prop house, and more straight out the author's warped imagination and this is a fun house dungeon with factions, NPC's, inside jokes, and more. But don't let any of this fool you this is a very, very, lethal exercise in death dealing right out of the gate. Through out this bizarre adventure is the Mad Mage an NPC who seems to weave his way in and out of the in house jokes and encounters. Some of these encounters DM's can use the following adventure elements and have players;
• See a microscopic basilisk
• Help a stoneworker understand carpentry
• Explore the Hall of Many Pains
• Meet Arne and learn about his son
• Travel through time to the Vietnam War
• Discover secrets of the Mad Mage!
Yes all of this stuff really is in between the pages of Green Devil Face but is it actually useful for a retroclone system or rpg? Yes and please hear me out here; because this is a perfect adventure to use as a Dungeon Crawl Classics funnel. Green Devil Face has all of the over the top gonzo elements that make it perfect as a DCC adventure. This is an adult adventure with all of the trimmings to keep things moving. Hell, it could be used as a meeting point between a post apocalyptic game such as Mutant Future and an OD&D style adventure setting because of the inclusion of modern technological anachronisms and relics in the adventure. Add it into one of the hexes on Carcosa or World of the Lost as a side adventure or quest. There's enough meat here to keep a mini game going for at least three or four weeks of play. This isn't an adventure that takes itself seriously and gonzo level is way past eleven. I can honestly see using this adventure with another retroclone style of game such as Crimson Dragon Slayer and the conversion wouldn't be too hard. The game is keyed for use with; "Originally written as a 0e adventure, Green Devil Face #1 is compatible with Advanced, Original, Basic, and Expert fantasy RPGs published between 1974 – 1983 as well as modern “Clone” games including Labyrinth Lord™, OSRIC™, and Swords & Wizardry™." Because of the very gonzo nature of this adventure it could be connected with another megadungeon or old school adventure really up the stakes for the PC's a twist they won't be expecting at all.
So is this a perfect dungeon? No far from it but its a dungeon with lots and lots of potential for a DM to customize and run their players through it. There's a lot of early Lamentations ethos in this adventure and its not been with with controversy to say the least but there's lots of interesting bells and whistles here for playing around with. Another side note is the fact that Green Devil Face is as much comedic OSR manifesto as adventure and satire but that doesn't make it any less entertaining or deadly. Personally I would run it as one more over the top weird OSR adventure. I give it four out of five for the sheer balls to the walls volume eleven bit of fun for a dollar fifty.