Some maids you buy give what's call Victory Points. Others have special conditions for getting the VPs (have more of this maid than anyone else, have an even number of this maid, have this maid chambered, or have this maid chambered with other maids). You count your VP after 3 piles have cleared. Ever played a deck building game? Basically, you buy stuff from piles in the middle. When 3 piles run out, time to count VP.