What is the ruling on purchasing game coupons whose price decreases with an increase in quantity, and which are used as a substitute for money inside the amusement park?

There is no objection to dealing with game coupons if they serve as a voucher for the amount paid and not an actual purchase, and the discount offered does not cause harm. However, if the amusement park includes forbidden acts such as intermingling (between sexes) and exposure of 'awrah (private parts), then it is obligatory to avoid it.