We now have 4 cats and two kittens.  When we were assembling this our one cat sat on every level as we built it watching my husband put it together.  The first day all of my cats were on it and we put it beside a corner cupboard and they jump up there and sleep on a blanket that I put there.  The only recommendation we have for this tower is to put two hinges backside underneath the ladder bottom.  This made the bottom platform much more secure when the cats were jumping up and down the tower.  If I had known how much my cats would have enjoyed this tower, I would have purchased it years ago.  Even the eight week old kittens have made it to the top cubby and are sleeping there now.