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PORTAL 2 RELOADED MOD
This will cause the future cube to vanish because of the change in its past, meaning the big button is no longer weighed down, and the platform the player is on will rise up to the finish gate. Portal 2's Reloaded mod is currently live on PC via Steam, allowing players to travel between timelines, experiment with a third portal, and more. Once on the second platform, relocate the present cube by shooting a portal underneath it.
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Without the light bridge, the cube will fall onto the big button below, moving the second platform in range for the player to jump on. Remove the portal keeping the future cube in place, and the platform will rise because the laser is no longer blocked. Make sure that the cube is placed directly above the large ground button, then step on the first platform.
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Bring the future cube through the portal and place it in front of the laser, blocking its path. There’s an obvious portal located on the wall above the button area, surrounded by non-portal surfaces. Next, use portals to bring the light bridge to the laser at the top of the room. Place the newly acquired cube on the ground where there’s a portal surface, then go to the future and bring its future self back to the present. Thanks to time travel, this is possible, as there is a light bridge present in the present and the future. This means that two light bridges are needed, one for the player to walk on to reach the button, and one to save the cube. There’s a spot on the ceiling in front of the cube’s trajectory where a portal can be placed, and sending a light bridge there will create a barrier that saves the cube from being fried. Pressing it will cause a testing cube to fall from the roof, but it will fall onto an aerial faith plate that launches it right into an emancipation grill, vaporizing it instantly. It’s unreachable unless a light bridge is there to serve as a platform. On the right of the chamber, there’s a button across the water. The goal of this chamber is to lower both platforms so the player can use them to elevate themselves to the exit. One is lowered by placing weight on the large ground button, while the other is kept up by a reticle that's powered by a laser near the ceiling. Upon first entering the chamber, the test subject will notice two platforms that lead to the exit.
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