While the fundamentals of free-to-play game design seem simple, adapting to this model and understanding it to the depth required to make a successful game has proved a tough challenge even for the most experienced game creators. One effective way to tackle F2P design is to think of its various techniques as a "toolbox"; by building up a collection of design "tools" which you can use to acquire, retain and monetise your players, you can build a comprehensive understanding of how this new business model interacts with your existing game design talents. This lecture will give you concrete examples of F2P "tools" which you can apply to your design, and show you how to create your own tool-based approach.