Is it possible to achieve the No Mercy heist without triggering the alarm while playing solo with AI

payday-the-heist

I can't find a way to crowd control the civilians during the first part of the level when I play with the AI. They don't provide any help to take down the video cameras and don't spread and prevent hostages from pushing alarm buttons, they don't answer the phone…

Also I think there's something to do with people coming from an elevator, but I didn't have any chance to understand what, because the alarm always goes on at that precise moment.
I always end up with the alarm on, fighting assaults all the way to the end of the mission.

Best Answer

Ok, it's a little bit tricky but possible in normal mode. I think it's nearly impossible in higher difficulty modes because there are simply too many civilians walking around the alarm buttons, and you can't keep an eye on the three at the same time (especially on the bitchy one nearby the staircase).

To do so, after you took care of the video cameras, immediately jump on the welcome desk and spam your yelling key (default: F) to get everyone down. Also aim at the AI and spam again to force them to get closer. Try to get at least one of them behind the desk. Use this method when you have to walk away to take care of the guard, of the maintenance guy or to set up the fake sentries.
You'll have to time it well; you want the AI to stay behind the desk while you are away. So call them and then run where you have to go; you'll have something like 10 or 20 seconds before they reach and then leave the position you gave them, trying to rally you, and therefore giving the opportunity to civilians to push the alarm button.

After this sneaky sequence, you won't need crowd control anymore so it should be okay.

Related Solutions

Way to identify the correct patient in the No Mercy level of Payday: The Heist

I'm pretty sure there isn't any. It seems to be exactly like the "find the chinese guy" objective in the Green Bridge mission: you have 3 locations and one of them is chosen randomly at the beginning of the event, without any way to predict which one.

The 3 locations are hermetically sealed; it's impossible to see inside and there isn't any clue on the outside. We could kinda call it "the Schrödinger's infected patient".

Moreover, if you don't trigger the alarm in a multiplayer game, each player gets a different dialogs from the doctor. For instance, during our last game, I heard that patient A was bitten by a monkey, but my friends heard that he came back sick from abroad. I suppose this is a bug. The best way to find out which one is the infected patient is to wait for the second turn and spot which one isn't ready to get out of the hospital.

In the Counterfeit heist, is it possible to remain undetected from the guests

According to a Wiki you have to do the following:

Prior to starting the heist, the crew is advised to spread out and find all 7 or 8 civilians, who are in Mitchell's kitchen, the garden, and sometimes Wilson's house. There will sometimes be civilians on the far side of the garden, and the girl in the bikini is sometimes in the lounge of Wilson's house.

Prevent all citizens from escaping when the heist starts, and restrain them with cable ties. You may have to kill some civilians if you are playing solo and they are spread out too much. Once the civilians are under control, set up a hacking device in Mitchell's basement, then move the bookshelf in Wilson's basement and start hacking the revealed code lock.

Undetected

Before any cops arrive, take the opportunity to search the houses, garden and garages for a crowbar, which is required for future objectives. Exactly two bars appear in each playthrough, and at two of the following locations:
Wilson's garage, by the car's rear right tire
Partially underneath the front of Wilson's bed
Mitchell's garage, in the middle
Mitchell's bedroom, inside a shopping bag near the bathroom
Right next to the pool
The shed in the far corner of the garden
Below the rear of Wilson's boat 
Be sure you are not seen by the neighbors. Once the crowbars are found, dedicate one crew member (preferably with a silenced weapon) to silently neutralize incoming cops, and the others to restarting the hacking devices as soon as possible.

If the crew manages to stay undetected, Bain will mention that someone must've seen something and that two officers are coming to check out the address. The crew must stay hidden (perhaps at the top of Wilson's staircase) and wait until Bain says the officers are inside before killing them with a silenced weapon or melee attack, or taking them hostage. If successful, the crew will remain undetected.

After a while, the police will call Wilson's telephone number, but the crew cannot pick it up. Two more officers will soon enter the garden through the side entrance. Remain hidden again (the top of Wilson's staircase works here too) and silently neutralize them once Bain gives you the cue. Shortly after, the police officers will be reported missing and SWAT will begin to arrive.

If you fail to remain undetected, then law enforcers will come as soon they are aware of the crew's operation. Units will be coming from predefined points of the map, jumping over fences and walls, and sometimes a helicopter will hover above Mitchell's house.

Found some videos, that should help