What are some of your best GM hacks for applying difficulty check modifiers?
I've got a few ideas of my own, but I wanted to poll the grognards and see if anyone had some go-to methods for modifying difficulty checks. I know that GURPS: Campaigns has a section that gives a descriptive range between +10 and -10 for difficulty, but I was wondering about the process that might lead a GM to end up at their final modifier.
My initial thought would be to curate a checklist of factors that would typically affect difficulty incrementally, and by how much. I haven't been able to find a checklist that exists for that purpose, sadly.
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