Probably just your old boiler deciding it's time for a percussion solo. But seriously, if you can hear it that loud, a quick peek can't hurt, right? Arm yourself with a broomstick or something!

Aren't triangles just the easiest way to make those numbers fit in the blocks though? I mean... every number is basically made up of triangles or lines. Is there actually something that links hopscotch to the Illuminati or are we just connecting dots that aren’t there?