Play the original Portal with Portal 2's portal gun, its sounds and Portal 2's test-chamber panels, read from your own Portal 2.
Play the original Portal with Portal 2's portal gun, Portal 2's cubes, turrets and buttons, and Portal 2's test-chamber panels.
Nothing from either game is in this download. On first Play, the mashup reads the gun, the props and the panels from your own Portal 2 and converts them for Portal's engine, which takes a few seconds. Portal 2's sounds are played straight from your Portal 2. Portal's own files are never changed, and your Portal saves stay the same saves.
Made with Melty's modding kit notes (MIT). Portal and Portal 2 © Valve Corporation. Fan-made, not affiliated with Valve. Code: GPL-3.0, remixes welcome.