Make NPC rescue rooms unique by making them kill-count rooms.

Own

Moderator
Like Toy Factory and Season Temple challenges in Story Mode. Right now they're more or less the same or weaker versions of rooms you can already face on the floor they exist on. Which is uninteresting and feels like busywork when you do rescue the NPC.

But if you had to kill 15-30 random respawning enemies in the same room to rescue them, that would at least feel something like a challenge. Adding that NPC to your town would be a memorable event because it's a mechanic used nowhere else in Arcade.
 
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