Back in March, some low-quality games from traditional genres, basically cheap knockoffs of titles like Angry Birds and Super Mario Bros., had been rethemed and rebranded as COVID-19 games. But they made no sense. You don't cure a disease by throwing toilet rolls at virus-like faces, or avoid getting infected by jumping over obstacles. What I wanted to come up with instead was a game that would really make a difference. A game that would demonstrate the problem of exponential propagation in a simplified, time-compressed form and promote several of the most effective ways to stop (or at least slow down) the spread of the virus.