This small model features the latest simulation game features of the iMODELER service version 6.0.3.. Here is a link to a quick guide: http://ilsa-consulting.com/Downloads/iMODELER_simulation_games_tutorial.pdf With version 6.0.3 comes the possibility to define surfaces with input and output texts and/or pictures. Ah, and you may opt (Menu .... preferences) to show curved arrows :-)