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Ralston-Purina wasn’t a traditional game publisher—it was a major American food and pet-food company known for its “checkerboard” brand and the Chex cereal name. That’s why its best-known DOS releases were promotional one-offs: Chex Quest and Chex Quest 2, family-friendly sci-fi shooters created by Digital Café on a modified Doom engine and originally packed into Chex cereal boxes in 1996. They swap gore for bright humor and simple objectives, yet still deliver satisfying old-school FPS pacing. Even after the company later folded into Nestlé’s Purina business, these two titles stayed legendary. On this page, you can play them online for free anytime you want a quick nostalgia hit.