The cost is 25ytl for adults & 15ytl for kids. We negotiated 20ytl & 10ytl when we went as there were 17 of us!! Teenagers paid kids price so that was ok. Brilliant day out. The slides close between 12.00 & 13.00pm for the staff to have lunch. Look out for the cake seller at about 3.00pm!! A real treat! (the cakes that is, not the seller!!). The entry price also drops to 20 & 10 ytl after 4.00pm if you just want to spend a couple of hours there. great day out for all.