Chex Quest is a child-friendly non-violent first-person shooter video game, created by Digital Café. It is a total conversion of the more violent video game Doom (with easier levels and modified graphics & sound). Chex Quest, notable for being the first video game ever to be included in cereal boxes as a prize, was found in boxes of Chex cereal in 1996. Source: Wikipedia, "Chex Quest", available under the CC-BY-SA License.