Massively Multiplayer Online Science (MMOS) connects scientific research and video games as a seamless gaming experience. Players are invited to solve crowd-sourced research tasks integrated in video games, thus contributing to real-world scientific research. Projects include a mini-game where participants helped researchers understand the coronavirus by classifying cell populations. Another one called “Project Discovery” involved 300,000 citizen scientists who were invited to analyse proteins for the Human Protein Atlas Cell Atlas. By converting gaming time into useful activities in science, this citizen science project creates a virtually limitless resource for research, and a unique opportunity to engage communities with science.