amp; Research Platform is focused on modelling and simulating complex computer systems and networks in a virtualized and separated environment. The platform enables realistic simulations of critical information infrastructures in a fully controlled and monitored environment. Time-efficient and cost-effective simulation is feasible using cloud resources instead of a dedicated infrastructure. In this paper, we present the KYPO platform and its use cases. We aim to execute current and sophisticated cyber attacks against simulated infrastructure since this is one of the key premises for running successful cyber security training exercises. To make the desirable improvement in the skills of the participants, a powerful storyline for the exercise is essential. Last but not least, we understand that technical skills must be complemented by communication, strategy and other skills for effective cyber defence.