Henning Jon Grini About Roles Name : Henning Jon Grini Software Role Publisher Type Year Mad Jumper (Unknown) Sinclair Programs Arcade: Platform 1984 Change Request You can request changes or additions here. You can upload files. All change requests are actioned as quickly as possible and you will be informed of the result. Details Files Your Name * Email * Details Your browser doesn't have Flash, Silverlight or HTML5 support. Submit Thank you for your change request. We will respond as soon as possible.