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Wiktionary
god mode

n. (context video games English) A version of play where the player character is invulnerable to damage, typically activated by entering a cheat code.

Wikipedia
God Mode

God Mode is a co-op, arena-based, third-person shooter video game focusing on survival mode style gameplay. It was developed by Saber Interactive in conjunction with Old School Games and published by Atlus. The game uses Saber Interactive internal game engine, Saber 3D, v.S4. Its gameplay was later used as basis for R.I.P.D. The Game.

God Mode (Person of Interest)

"God Mode" is the twenty second episode and season finale of the second season of the American television drama series Person of Interest. It is the 45th overall episode of the series and is written by Patrick Harbinson and Jonathan Nolan and directed by Richard J. Lewis. It aired on CBS in the United States and on CTV in Canada on May 9, 2013.