B3: Palace of the Silver Princess
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Palace of the Silver Princess or, as artist Bill Willingham dubbed it on his way out the door, Phallus of the Silver Princess, was a module written in 1980 - rather, two modules. Joan Wells, host to the design-department's only vagina at the time, wrote the first one. TSR then inflicted a total Moldvay rewrite on it, probably the version you could find over the 1980s.
Either way 'tis B3 in the Moldvay Basic line.
Orange Module Bad (and Porny)
In this version the party explores the ruined castle of Argenta, a "long-dead" princess.
As with B1 and, to a more-quarantined extent, B2 ("Caves Of The Unknown") Wells had left some of the map vacant for the DM to flesh out. This practice was however going out of fashion in the AD&D module-lines.
Anyway what wasn't there wasn't nearly as troublesome as what was. As artist Bill Willingham noted, the actual content was Society for Creative Anachronism fangurl crap. Not to mention that there's a missing staircase so the princess and, one assumes, the party cannot actually reach the top floor. And the new monsters were deemed too silly, like the hermaphroditic ubues, or the six-legged platypus (wtf?). I mean, come on, it's not like early-'80s TSR would ever let shit like that loose.
Accounts differ on how Wells reacted to the criticism. Wells claimed to the end (she died 2012) that she had worked closely with her designated editor Sollers. Other designers claim that she went BAAWWWWW to her chum Gary Gygax, who resisted calls to change the content. And the management had pissed off the workers belowdecks, by firing a bunch of staff for instance.
So a revolt brewed in the art-department. Wells (and Sollers, and the TSR management) got TROLOLOed by Erol Otus who, in a passive-aggressive douche move, snuck portraits of the shitcanned ex-TSR staff into the artwork without Wells' consent. On those hermaphrodites no less. I mean, we're not prudes or SJWs here but Jesus Christ.
Willingham said fuck-this-noise and ragequit mid-drawing, leaving the rest of his artwork for someone else. Otus further slipped in some sexytimes elsewhere. Kevin Hendryx went Smithee and demanded his name go UNcredited. Laura Roslof for her own part just went full literotica, drawing in a woman tied by her own hair being pawed at by goblinoids or maybe demons (they didn't have devils in the Basic line).
And repeat: not that upper management cared or even had the wit to judge but, the content of the text was terrible.
Green Module ... Okay I guess
TSR's suits took one look at the end-product and STOPPED THE PRESSES. OH NOES DEMONS! OH NOES SCANTILY CLAD BOOBIES! Even Frank Mentzer has observed that other modules were already out with much worse. [Tho', the altar-girl scene in 1976's Eldritch Wizardry aside, not in juxtaposition, and not lately.]
Tom Moldvay reissued a near-completely different version immediately after, with a dark green cover. Wells still got co-credit for the work.
As for the differences, besides the artwork: except the decapus Wells' new monsters got buhleeted, and so did the vacancies. You know, anything that might be original or give DMs further creative ideas. Much of the plot also got redone: Argenta is still alive, and needs rescuing.
In the end, B3 did end up a win for TSR. Jim Bambra at White Dwarf liked the Moldvay version, suggesting it belonged in the Basic Set instead of B1 or B2.
Legacy
The orange version is a huge seller in the used-market.
As to where in canon it goes: Moldvay wanted it for the Adri Varma plateau northwest of/in Glantri; the later B1-9 omnibus shifted it to Karameikos. Wells herself might have intended that the outgoing river flow to B2's map, wherever that may be.