i got this as a gift for my daughter first birthday and was excited for her to use it. The actually castle has numerous opening to blow it up and I used a air mattress pump to inflate it. It not too big but does take up some room. There are two openings to this and it comes with maybe 20 balls, We wish it would of came with more because we had to go out and buy more to actually make it a ball pit. My daughter really enjoys playing with it and throwing the balls through the holes. great toy.