Tent and tunnel can be constructed thanks Poppup Ewithout problems. The tunnel is secured using 2 buttons on the tent and holding quite well. Neither tents nor balls smell chemically.
When you enter our daughter had problems at the beginning, because the tent edge is pulled so that the balls rum balls everywhere.
The supplied balls range in any case. We have 200 bought it and will buy another 200 when our daughter is a bit older.