In Linnaeushof, children up to 8 years can ride in the minicars, a kind of bumper car especially for children. You do not have to pay extra for this and you do not need any coins either. This attraction is included in the entrance fee of the playground. Do not worry about safety. The cars do not go fast, they have seat belts and there is supervision from the reception.
The bumper cars can be found in the indoor playground of Linnaeushof.