OK, good. I was getting the impression that GM could only react to player input, and could never start anything new. The GM shouldn't have to wait for a player to ask for an ambush for one to occur.
Well, certainly not in Dungeon World. I mean, frankly, there's potentially a great deal of leeway in terms of how much of the action in DW focuses specifically on elements that come from the player side of the table and the DM side of the table. So, GMs DO perform prep, and nothing really says that the elements of that prep must be overtly suggested by players. The GM is just told to 'ask questions, use the answers', and that maps 'have holes in them'. You are supposed to generate 'fronts', which are basically a lot like a 'meta-plot', and they can have varying levels of significance and screen time. Once things are set in motion however, the GM should not be trying to steer the game in some direction. The Great Orc Invasion might be a front, if the PCs don't deal with this orc threat, well the town will eventually be overrun! Now, this could be sort of a background thing that slowly takes shape, or it could be an immediate sort of threat that will rapidly develop but doesn't shape the wider campaign for long, unless the players ignore it.
Are there any that mix the simulation stuff with the story now stuff? A hybrid might be easier to digest as a start.
There are tons of games out there. I would say that games like D&D 4e can be played in a pretty Story Now mode, and that game certainly approaches mechanics in a fairly standard D&D type of way, up to a point.
I thought the GM was constrained to always go along with player ideas if they roll well enough. I'd also be cheesed as another player too depending on what was being injected in the game. So there are times the GM can flat out say no to what a player attempts? Weren't people in this thread saying 4e leaned into SN, and that did include the advice for the DM to "just say yes".
OK, so if a player, for example, states they are going to make a combat move, the GM first could say "well, your sword has no chance of hacking through the dragon's iron hard scales..." and the player is going to have to come up with a better plan. Maybe the player says "I try for the creature's mouth" and now the GM is going to present the situation as something like "As the dragon opens its mouth you hear the sound of it drawing air into its lungs and smell brimstone..." Now you're in the middle of it! That sword stroke better produce some kick-ass results! Its not like I said 'no' when the player basically offered to hack-n-slash with the dragon, but now the fiction is clear, either the sword blow is true or its grillin' time! The player will just have to roll the dice and take her chances at this point, a 6- is unlikely to be pretty...
Right, but I like there to be some time spent on play without stakes. Probably not every sessions as that would be boring, but between adventures/missions. Maybe check in on what some NPCs were doing while the PCs were gone.
I mean, its all up to the players and GM of course. Set your pacing. DW has some GM 'stuff' that happens, there are Grim Portents and even Dooms. If the players say "well, we're just going shopping..." The GM could simply say "well, OK, lets do that, but while you're in the market place you hear the news, the Orcs sacked the priory outside of town." Its not ACTION, at this point, maybe there's a bunch of RP here too, the players see some injured priests, they ask what happens, whatever.
Considering the fantasy trappings, I think Dungeon World would be a bad game to start. I'd be comparing it to other fantasy games in the back of my head the whole time. Perhaps as I've never played a horror TTRPG, a Story Now version of that, maybe as a one shot, would be preferred as toe dip in.
Yeah, the thing with Dungeon World is there's the danger that everyone involved might just sort of try to play D&D. It won't work well, but its not always obvious to people why it isn't so great. Apocalypse World, or Blades in the Dark, etc. might be easier to use due to simply being less familiar genre. I guess Masks is a pretty decent Supers PbtA, though I know little about it. There are various sci-fi ones, and lots of other types as well.