The Ruby Realm is a multi-level adventure game about photosynthesis. Players must navigate a cavern in search of missing friends. Luckily, Biobot Bob– a robot powered by artificial photosynthesis– is there to help payers fend off evil enemies. Players must find light sources where Bob can generate the glucose he needs for power. Using Bob’s Molecule Replicator, they shoot light beams at carbon dioxide and water molecules, breaking them apart and recombining the atoms to form glucose. Through these and similar actions, the game helps students construct an understanding of photosynthesis by letting them actively participate in the process of chemical change.