Skulls are pretty scary. I'm sure no one wants to see a human skull, so why don't we try and avoid that altogether. That's the purpose of Cubitsu. You're tasked with clicking the arrows next to the rows and columns until you get a match of 3 stars in a row or column, but if you happen to match up 3 skulls in a row, you are doomed. Make sure you pay attention to the changes every time you click on the arrows, because the next click may be your last.