Sage does indeed lend sage advice ;)

Actually, I agree with Scrape; scrap the torch option. Having handy equipment is what Adventuring Gear is for :)

Link has been fixed! Thanks Nifelhein!

Jonatan's move very much follows the same idea as mine, but he just had a much better execution. Nice one :)

I agree with Nifelhein; the GM should not emphasize how bad the worst is at specific things, but rather how good te best is.

There are a lot of options, depending on the circumstance. The posts here cover a lot of them, but I wanna add that sometimes it won't trigger a move at all. It's totally legit to be like "The duke's guards are really sharp and the Fighter is wearing plate mail and carrying three weapons. There's no way he'll make it past."

Remember that Tell the Consequences and Ask is in your arsenal, and so is Separate Them. Those moves work together here. I think it's cool to say "Thief, you know the Fighter doesn't stand a chance of being unheard. You could follow him a mile away. He'll get you caught in a heartbeat and you'll be right back in the duke's prison by nightfall. What are you gonna do about that?"

The Fighter can take off his plate mail and don some Leather Armor and a shield instead, in which case they could make an attempt. He might later knock a guard unconscious and "lend" his scale mail.

Players are pretty smart, they will react with plans like this when you tell them the requirements or consequences and ask. Which is great :)

I actually have a pretty good idea for a move that functions along the line of "Undertake a Perilous Journey" and "Recruit" for group stealth rolls.

I will post it later, when I'm done with it.

The way to deal with it depends obviously depends on what's actually happening in the fiction.

If the entire party tries to sneak into the wizards tower undetected however, everyone is essentially acting despite an eminent threat (Defy Danger trigger), which means that everyone must roll to Defy Danger. From the book:

[quote src="Dungeon World, page 18, in the middle"]A character can’t take the fictional action that triggers a move without that move occurring.
[/quote]

The thief example is therefore handled differently than the rules suggest. This doesn't mean it's a bad way to go, it just mean that it's not supported by the rules.

The way to go here is to make excellent use of "Show signs of an approaching threat" and maybe some location moves then (assuming someone rolls below 10)?

If it comes up a lot, the best way to deal with it is probably to make a custom move I guess?

How does a group roll a collective stealth roll?

I always hated the "everyone rolls" approach, it really irks me. Having everyone trigger an Avoid Danger is bad, since even if everyone had equally good stealth, it would all come down to the worst roll.

Or would it? In a lot of games it's like this. In D&D 4e they say that the person with the worst modifier makes the roll. I hated bith approaches. In DW it's different since 6- isn't necessarily a failure, but it's still a lot of rolls that could go tremendously bad.

Having everyone "aid" seems very weird too, since it implies that they help someone go undetected, but doesn't do so themselves.

How would you handle it?