After leaving TSR, Gygax founded New Infinities Productions, Inc. (NIP), a company focused on developing new role-playing games and related products.

NIP created the Dangerous Journeys role-playing game system. It aimed to capture a darker, more realistic tone compared to D&D. This was one of his first large projects outside of TSR.

TSR sued New Infinities Productions, alleging similarities between Dangerous Journeys and Dungeons & Dragons. The lawsuit was eventually settled, and Gygax was required to make changes to his game.

Gygax engaged in various freelance writing and consulting projects for the gaming industry. He continued to contribute to role-playing games and related media.

Gygax worked on projects related to his original D&D campaign setting, Greyhawk. Although he no longer had rights to the name, he created similar material.