How to let players roll perception checks without suspicion?
30110
How to roll perception checks for characters who aren't actively looking without arousing suspicion?
115587
How do you make hacking useful without excluding other players?
134253
How to encourage the GM-curious?
124464
Can you dispel a magic effect you can't perceive?
104356
How do I detect if players have sufficient EXP levels?
26957
How to use, and not to overuse, Insight skill checks?
55755
How can I play games with closed information with players who cheat?
102095
Is there a way to learn someone's level in game in DnD3.x?
118944
How to determine surprise when only part of a side is stealthy?
37848
When should I make my players actually roll for stuff?
116602
I want to run a trial in D&D 3.5, but how can I avoid invalidation by magic?
95255
How to get players to be curious and ask questions?
115946
How do I depower overpowered magic items without breaking immersion?
22640
How do I make A* agents avoid other agents?
13976
Can I cast Nondetection and Divination spells on myself?
12776
Is there a spell, item, or other game feature that would give my character insight to an enemy's weaknesses and resistance?
74256
How do I let the world know about my role-playing system?