In Every Extend, players control a ship with the only ability to detonate itself. Stages begin with a set time limit and enemies appearing on screen in randomized patterns. When the player detonates their ship and an enemy is caught in its blast radius, the enemy will explode and have its own blast radius that other enemies can get caught in, causing a chain reaction.

Every Extend Extra is a redevelopment of the popular freeware game Every Extend, which was a personal project by Kanta Matsuhisa under her "Omega" pseudonym.