That's Whack!

It's actually fairly easy. I got it this morning on the 2nd attempt. Just prioritise Hogger and don't hit the dolls! Consider installing the Darkmoon Faire DBM addon which alerts you when Hogger spawns.

Use the mouse to steer and run and 1 on the keyboard to whack! You might need to pull the camera out as well so you can get a good view but not so far out that you can't easily identify Hogger.

It really seems to be reliant on luck of how many Hoggers actually pop.
But my method was to pan the camera to have a top view of the barrels, so you can see right away when the Hogger is about to pop up. Always be running even while swinging the hammer, never stop running even if there are no puppets up (I used my mouse to run and 1 key to hammer). You can run through the middle barrel, but you cannot run through the outside barrels, so try to stay in between the outside barrels and the middle. Don't bother looking at your progress bar it will only distract you. Stay focused and you should get it in a few tries. Good luck everyone!

Unless they change something - Is this even currently possible?