In Gen, the player maneuvers a slew of flying particles by directly touching them to defeat enemies. Designed around the fun of maneuvering particles flying freely en masse, the game offers players a delightful experience of controlling and multiplying the particles and achieving their goals. Playing Gen in itself leads to various works of generative art. That is, finishing a stage of the game means completing a piece. Generative art organically combines mechanical elements based on an algorithm and calculation with many other different elements including random factors. This means that, while works of such art are systematically created, they are unpredictable one way or another. Offering the fun of manipulating a massive amount of particles coupled with the delight of creating works of generative art, Gen has emerged as unprecedented gameplay.