Stargate

Gameplay involves shooting enemies while carrying humanoids to safety through the Stargate. Entering the Stargate can warp you to the nearest humanoid in danger or propel you ahead on the first 15 levels if you have 4 or more humanoids. Warping with 10 humanoids gives extra lives, but requires careful planning to balance safety and advancement.

The increased enemy presence on screen adds an extra layer of complexity to the game. The Inviso button makes players invisible to enemies and themselves, requiring them to rely on following their bullets to track their position on the screen.