Hi Jenny, Anytime you are setting your inflatable up in an area where you cannot use the included anchoring stakes, you can always anchor your inflatable with weight. We typically recommend at least 100 lbs of weight for anchoring, divided up evenly at each corner. We offer sandbags which you can fill with sand as an alternative to ground stakes. You can find our sandbags for weighted anchoring here: http://www.blastzone.com/sand-bags-for-indoor-use Sincerely, Blast Zone Support