Blow 50M on a nice house, car and some expensive stuff. Split the remaining 800M into 4 parts:

• 200M for general savings and safety money, allocated in gold, silver and cash in multiple currencies
• 200M for low risk investments that pay regular dividends - real estate, stocks in "value-type" companies, bonds
• 200M for high risk investments - stocks in "growth-type" companies, cryptocurrencies, maybe a bit of startup investments
• 200M for investment in my own indie game studio, this budget would be sufficient for several big projects

As my wealth increases further, lead a life rich in experiences, build a strong family, educate my children on how to handle such a fortune (and also how to live without it), develop a few business projects, do some philatropy and well-thought charity (like scholarships for gifted children from poor families and underdeveloped countries).