In order to programme the game kit via the MigProg interface you need a microcontroller already equipped with a Bootloader programme. The enclosed controller is fitted with such a Bootloader. When you buy a new controller or loose the Bootloader programme through a mistake it can be re-installed via the ISP interface.

To do so you need an AVR-ISP-programmer. As this interface is only of interest to advanced users it does not belong to the standard equipment of the construction set. It can be ordered via the Internet.