simply but very small toy puzzle , training child's coordinates , observance ability to think , sense capacity . random 18 stool , first put a stool , apiece then take turns to upper iterated , how to stack at random , can use stool cutout on part , wear , hang , , , informality in any form and methods , shelfstool will erythematous stackable looks ( can somewhat lower difficulty , with other hand help hold nethermost bottom stool ) , anyway when hands off when , in addition to the first stool outside , other after-discharge 's can't all floor , and stool tower can't collapse , who is who 'll lead to the collapse of the lost . . . may play , can also be a small family parent-child game .