(from the Rules of Play)
The 'Rouges' Gallery' solo is a Tunnels and TrollsTM adventure for a single character of ANY level from ANY T&T race. The monsters in Rogues' Gallery have a MR rating based on your characters [sic.] level.
(from the Introduction)
The Gallery lies in a small vale less than a day's walk from the town of Boran. Few townsmen can ever be found admiring the paintings. You have heard the stories. Rogue Wizards gain a certain amount of respect / notoriety from venturing deeper within the Gallery's walls. All types of delvers enter the Gallery: to test themselves, prove their worth, or just gain the Gallery's only sign of respect, a portrait within the courtyard.
At the Blue Frog Tavern Yahoo! Group, on August 20, 2017, author Brian Penn commented on this adventure he wrote.
Rogues' Gallery is really a gift to T&T community. One day I may rewrite it and the rewrite will be very different.
For now, Rogues' Gallery is really an accumulation of multiple published solos. Those solos inspired me and I used the inspiration to build up a monster solo for Rogues only (true to Rogue nature anyone can join).