Hey Josh yea they are just upside down tiles, i think they are 40cmx40cm. They generally only use the top and second tile but as you can see in the picture i now have a few more rocks inbetween the levels so they get a tighter fit. I do think its important to give them the option for a cooler place to hide though at the bottom becau other than the moist digging box they dont really have any other hides in hte enclosure. The system works pretty well becaus it allows me to only clean the levels which get pooped on which is pretty often and pretty messy.