Chex Quest was developed by Digital Cafe and released in 1996. It used the id Tech 1 engine. It was developed as a promotion for Chex Cereals and was included as a gift in the cereal packs and that certainly was a first!
There was a sequel Chex Quest 2 released the same year. This was an addon and required the original game to play. So I have not put it on the game list as a new game.