Portal Gun in Black Mesa

Play through Black Mesa in Half-Life: Source with Portal's portal gun in your hands from the very start. Aim, click, and open a blue or orange portal on any solid wall, floor or ceiling. Step into one and you come out of the other, keeping your momentum, so you can fling yourself across the facility.

The portal gun model and its sounds are read from your own copy of Portal while you play, so you need both games installed. Nothing from either game is copied or shipped.

Controls

• Mouse 1 – blue portal
• Mouse 2 – orange portal
• R – close both portals
• G – put the portal gun away / take it out again (brings back your normal weapon controls)

Solo play. Portals stick to solid walls only (not doors, props or monsters).