Everything you need to know about NFTs, written by Devin Finzer of OpenSea. Also provides a useful history of NFT usage across blockchain games and virtual worlds.

Defold is an in-house game engine by King. In May 2020 it spun out of the game company and became fully owned by the Defold Foundation. A good case study on transitioning from closed to open source.

A more complex system design tool, useful if you want to model your systems more accurately. Also usable for game loop design and token engineering.

A research paper from Outlier Ventures on building an open metaverse using Web 3.