The players won't care about how pretty you make your maps. Make them functional and ugly, and you'll save up so much time for other prep.
HipsterTenZero
Whatever you do, don't mix up who the killer is behind the scenes just because the player guessed it correctly before you wanted them to.
Grizzly McSnarl, this huge, lumbering guy with a bad case of RBF. He never takes a hand off the big-ass knife on his hip. If the players dig a little deeper, they'll learn he's an anxious kind of guy who worries too much about every little thing, and coasts on his intimidating looks to deter trouble.
I always maintain that the best oneshot is the one you cobbled together last night. Get a little weird, slap some stuff together, and let the players fly off the rails.
I use Gimp and just hand-draw everything. I've learned that players don't really care too much about maps, so going above and beyond with high quality, ultra detailed stuff is wasted effort unless you derive joy from the creation process.
Resist the urge to run Pathfinder or Dungeons and Dragons. Those systems empower the PCs to fight evil, and win. That power undermines the horror so completely, it may as well just be a coat of paint. You might think "hey, what if I just make the monster too strong to actually fight?" That's going to lead to a TPK 80% of the time. The other 20% of the time, the spellcaster will pull a wild move you didn't anticipate and come out on top anyway.
huh. i've always solved that problem by polluting the dungeon with glyphs of warding to raise a middle finger to future generations of adventurers hoping to find treasures
smuggled in under the bell ofc
what a fucked up animal who defies categorization. i love him
Edit: I have been informed that this is a fabricated facimile of a platypus. I am no longer in love
the fucking long sabaton
-a nuclear winter!
(i am shook that nobody else swept in to finish the line)
I pretty much hang around the Heroic Fantasy genre, and my thoughts on running it are very different from my thought's on playing it or otherwise. But Pathfinder 2e is definitely my go-to for running. Shit just works. I cannot express how much I appreciate the encounter budget actually being accurate instead of just a vague shoulder shrug like earlier systems.
As far as other genres go... I've run Scum and Villainy for sci-fantasy crime dramas, and it wins by doing absolutely nothing! I'm just not enough of a Sci-fi Greg to run more in the genre, heh.