We introduce the whole Office Lean toolset as follows: Lean priciples and tools, Toyota-House, mobilization of a Lean project, problem and goal statements, preparation of a Project Plan, value-flow analyses and hunting for Wastes, structured problem solving methods (Pareto, Isikava-diagram, ’Ask why 5 times’, brainstoring), prioritization matrix, mistake proofplanning. Practical learning of Lean approaches and tools is supported by a parallel simulation game.