This is the mind map I made based on the contents of the fifth chapter of The Duolingo Handbook .

The fifth chapter focuses on the concepts of making it fun. It is not just about the importance of fun, it is about creating a culture that cultivates creativity and innovation.

The main key points are:

• a product built on play that talks about the approach to gamification and the importance of fun in the product. Duolingo is a learning app that is competing with social networks
• quirky culture that is characterised by a sense of humour and a willingness to take risks
• wholesome and unhinged to emphasise the need to balance the fun with the seriousness of the product

Below the mind map.