Megoosa is the best (or, more likely, worst, lol). Geese are scary af when I run into them in the park, because they are way taller and louder than expected, and they strut right up to me like, “Hey, I know you’ve got bread. Hand it over, or we will peck off all your minor appendages.”
When you go through self-check, you should really be tipping yourself.
I start by making a map. I am terrible at making maps. I try to improve my map by using a transparent quilting ruler, defining a scale, and carefully noting the measurements of all the rooms. I somehow manage to change my scale several times during this process, write down the wrong measurements, and get confused about which lines are which on my quilting ruler. Complicating matters, my quilting ruler is big and heavy, and slips around on the page. (Naturally, I don’t notice).
Since my dungeon has multiple levels, I am very careful to include staircases, which, since none of the floors are the same size and shape, don’t actually join up from level to level. I notice that everything looks a little sloppy, so I go over it in pen, and erase the pencil lines. This makes it look nicer. It also destroys any last traces of geometric plausibility.
When I’m finished, my Escher-esque monstrosity is so impossible to navigate that it doesn’t even need monsters. The entire party will just get sucked into the treacherous anti-grid of the map itself, and never be seen again. If the GM asks me to explain the map so they can extract the players, I will be unable to do so, since I have a terrible memory, and can’t read my own handwriting.
You would then have to have someone impersonate the dead baker during the competition, or the murder would no longer be secret. You’d be on the short list of suspects, no matter how good your disguise. I think mind control would be a more practical solution. Just make it impossible for them to win, without getting arrested.