The Aperture Science Handheld Portal Device also commonly known as a Portal Gun or by its acronym, "ASHPD", is an experimental tool used to create two portals through which objects can pass.
Used in the Aperture Science Enrichment Center's testing tracks, it is a Test Subject's primary tool to complete each test, as well as being a mandatory travel aid outside of testing areas.
- In Mari0 it has the ability to reset or destroy your portals, while in the Portal games it is not possible without an Emancipation Grill.
- In Portal 2, Chell manages to shoot a portal to the Moon, showing the ASHPD's range. However, in Mari0, the range is the egde of the window.
- In Mari0, Mario has the portal gun for an unknown reason. The fact the GLaDOS is not present (currently) further complicates the situation. Mario always has his gun unless he dies.