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As a GM, you should have a sheet with the stats for your PCs that determine these kinds of rolls. If the PC wouldn't know if they succeed or fail, then the player shouldn't know the result of the roll, or sometimes even what the roll is for in the first place.
It's hard to avoid metagaming when you very clearly failed a roll and the GM says "Everything seems fine and normal to you"
That's why you call rolls for no reason, though.
Or trust your players to metagame in the opposite direction, making terrible decisions.
When the low rolling character convinces the high rolling one, that they are seeing things, the real fun begins.
That is one alternative, yes. Needlessly tedious in my opinion, but that's just my personal taste.
Doesn't need to be often. Just enough to make them more (or less?) paranoid.
That's just meta-meta-gaming imo. Fine if that's your group dynamic, just not my thing. Personally, it seems like way more time and effort.
We, as human beings, often register false positives or harbor paranoias - noises where there are none, still shadows turned to sweeping figures. Rolls without reason simply simulate that within the context of tabletop roleplaying.
I would actually pair that with secret rolls. Every once in a while, just roll the dice behind the screen, consider the result sagely, then make no mention of it and continue as usual.
I mostly disagree. It takes away a feeling of agency even if its still random at the end of the day. Just trust your players not to meta game. There are exceptions when it would be hard for the player to still get the intended experience when not meta gaming; but leaving the existence of that experience up to a roll in the first place is probably whats at fault.
Perception stats exist for a reason, and I'd argue they're usually incompatible with knowing the result of the roll, even with players who try not to meta-game. Even if they behave, they're subconsciously going to know how they rolled and that will change the experience, unless you start meta-meta-gaming (changing the success window, frequently calling for rolls for nothing, etc.). Personally that seems like a pound of cure vs an ounce of prevention.
If a semi-spoiler-laden, actively counter-meta-gamed experience is what your group likes, more power to you. But more often than not, I think the GM rolling for checks where success/failure isn't obvious preserves the experience for all players and prevents meta-gaming, both intentional and subconscious.
My experience is that, in practice, players actually like secret checks more often than they don't. The feel-bad of "player agency" loss (what agency is there in rolling a die? It's literally an agency destroying mechanic) occurs at the conceptual level, long before ever experiencing it at the table. Telling a player that just hid that they don't think the guards can see them really heightens the immersion, and players tend (most of them, most of the time, on average) to get into that.
You can't have tension when the player knows they rolled a 19 on the die.
Yeah, I love rolling dice, but certain rolls shouldn't be done by the players.
Rolling on a hit in combat? That should definitely be the player. You know how well you swing your sword and when it makes good contact.
Rolling on perception should almost always be done by the DM. This is especially true when another party member can rescue the bad roll. Like, someone rolls to spot a hidden enemy. They fail, but shouldn't know it, but they rolled a 2, so... Another player at the table sees this horrible roll and they have their character light a torch and look out into the wilderness. Sure, that's metagaming, but it's really hard to avoid when you know someone failed a potentially important roll.
One idea I'd like to see, and might try if I ever DM'd a game would be Dunning-Kruger rolls. The Dunning-Kruger effect is basically how people who are incompetent at something sometimes think they're much better than they are, and people who are experts (and realize how complex things are) underestimate their own competence.
So, in this case, the DM rolls a die which says whether the rolls are normal or reversed, then the player rolls. If the DM's roll said the player's roll was reversed, the player's 20 might become a 1, or a 1 might become a 20 (the actual number is 21 - roll). Mid rolls stay roughly the same: a 10 becomes an 11, for example.
If the barbarian is trying to check for traps and gets an 18, the DM might say "You're confident there are no traps", but that could be the result of overconfidence when they really "rolled" a 3. If they get a 10, the DM might say "You didn't notice a trap, but you're not sure". You could set this up so if someone has a proficiency, the DM rolls a D10 and only a 1 means the player's role is reversed. But, if the player is trying something they're not good at, a 1 to 5 on the D10 means it's reversed.
I haven't tried this, so there may be serious flaws in it in reality. But, I like the idea of players still being able to roll for something like spotting a hidden enemy, but not knowing for sure if their roll is good or not.
This is why you tell them sometimes the good result on a low roll.
Didn't old school D&D have the DM roll on the player's behalf?
Someone clearly wants a visit from the anti-meta-gaming Tarrasque.
If a player metagamed like that at my table, I'd punish them by not having any monster appear until everyone is back in bed. And have the character on watch be surprised.
The first (and pretty much only) time I played D&D I didn't know what "metagaming" was and accidentally thought about the puzzle as myself instead of as my player. Apparently the DM wanted justice and I ended up ruining the session for everyone. Needless to say I didn't go back out of guilt
Moral of the story: please try to be patient with your players. Not all of us are great at avoiding metagaming immediately :\
The way that my groups play it, the party is basically a hivemind of everything that the RL players know (minus Bestiary minutiae the PCs would have zero reason to know on first encounters), plus any knowledge the PCs might get from dice rolls. Just because I'm playing the 8 Int barbarian doesn't mean I have to go sit in the corner waiting for the next roll for initiative.
We just handwave the solution as saying the smartest PC came up with the plan, or if a dumb character rolls high, we role play him catching the Smart Ball and have the other PCs react in character.
Different tables have different tolerances for metagaming. Sorry you had a table that would rather browbeat the new guy for pushing that boundary instead of giving you a chance to adjust.
I wish I would have played with you :\
My favourite solution to tables with that sort of slightly meta vibe is to introduce a plot reason for it.
Telepathic connection between the players for reasons. My favourite being myconid spores which sorts comes up in BG3.
That's kinda dumb... It leads into why I don't really like "puzzles" in the traditional sense in TTRPGs... Either it is simply a DC you have to beat in a roll, and that is it, or it requires the player (not the character) to be good at solving puzzles. Otherwise, it isn't a puzzle, it is just an atypical "lock" requiring an atypical "key" reminiscent of old point-and-click adventure games where you just can't proceed until you find the McGuffin (some random detail or piece of information that is hidden away that in turn "solves" the puzzle that you could not have hoped to solve without it).
I'd love to be proven wrong, but I definitely haven't seen it done well.
This is why I tend to lean more towards puzzles that test how prepared characters are and how well they know what their characters can do. And even then I usually have a longer/more difficult way around the puzzle just in case they can't solve it. Like for example I have a magically locked door that they can try to get open but it would be difficult unless they have a spell or maybe getting lucky trying to lockpick it. However there is also a small cramped tunnel they can go down instead that will also get them past the door but will have some challenges along the way.
I just came up with a possibly acceptable middle ground of my own... Puzzle is intended for the players to solve, but if characters have an appropriate high mental stat or characters that roll well on an appropriate skill check would get varying degrees of hints or clues. Maybe? I feel like I'd have to try it to see if I actually like it or not. It feels like a sweet spot compromise, but still requires meta-game problem solving, but I feel like that is unavoidable - you can't actually think with your characters brain, only your own. At least with current technology, lol.
Honestly, perception checks should be rolled behind the screen. Or anything where the character wouldn't immediately know the outcome.
Sure, players shouldn't act on things their character doesn't know, but why give them the temptation?
Vor DM offen rolled which shift would get an encounter. Then sometimes the only low roll is the one not having anything, which also prompts giggling.
Oh, no, I just do that to make you paranoid.
Or do I?
A happy DM is a vile DM
"The room appears to be empty"