B/X Known World
Well there’s your problem. Pulling back the curtain like that only ends badly. No wonder your players feel bad about missing stuff and think they need to be perfect. You're pointing out every mistake they make.Again, I never said anything about players reading the adventure. How did they know? Because they asked me after the adventure was concluded, and I told them.
I don't believe in hiding game mechanics from the players, otherwise, they can never learn about the game. If they ask, I'll explain at the end of every adventure I run.
Players: "What did we miss?"
DM: "You guys missed so much stuff. Here's a list of the 30 things you completely skipped."
Damn. Maybe don't do that.
You're not "concealing game mechanics" by not revealing DCs or things they miss. The game mechanics are: roll 1d20 + relevant ability modifier + misc modifiers. The players already know that.
"If you'd only rolled a 15 instead of a 12, you'd have found another 1000gp..."
That's rubbing the players' noses in their failure. Just a suggestion, but maybe stop doing that.