Halloween isn’t for a few more days, but “Dancing With the Stars” delivered more than enough tricks and treats on Tuesday to tide us over.

During the annual Halloween episode, the nine remaining Season 34 couples Monster Mashed all over that ballroom floor — not only with their regular duets, but with the recently revived dance marathon round that left up to five bonus points up for grabs.

Here’s how the marathon worked: For four straight minutes, all nine couples performed nonstop at the same time — first in a hustle, then in a lindy hop. One by one, the judges eliminated couples from the marathon,…