non-D&D stuff:
-
City of Lies (L5R; 1998)
this is imho the best rpg supplement published ever!
is a samurai investigation sandbox
… the adventure here works better for a finale of a long campaign -
My Big, Fat Caped Wedding (Champions; 2005; is in the Villainy Amok anthology)
super funny superhero adventure
I only changed the NPCs to Marvel characters, so the players recognized the NPCs
ran this gem 4 times, 3 of those times at an indie Thursdays night -
[German] Namenlose Nacht (The Dark Eye / DSA; 2014)
investigation scenario in a bathhouse, where the aristocracy are having an orgy
best DSA single adventure
the only downside (and advantage) is, that is so build into the setting, you cannot play it somewhere else while keeping the impact
ran this once -
[German] Die Herren von Chorhop (The Dark Eye / DSA; 2002)
political adventure in the city-state of gambling
looks like a single adventure but there is so much material there,
that you will need a year to finish it
ran this once -
Lotus Blossom’s Bridal Path (Tenra Bansho Zero; not sure about the year ~ 2012)
amazing adventure about love, war & loss
one of the best oneshot experiences I had as a gamemaster
ran this 3 times, 2 of those times at an indie Thursdays night -
Jail Break (Unknown Armies; 1999; is in the One Shots anthology)
“Four convicts. Five Hostages. One Gun. Do the Math.”
very good if you have a lot of players - we basically LARP-ed this
ran this once
edit: added more gems 