Portal Reloaded is one of the newest fan-made mods for Portal 2. Within this mod there are 25 puzzles, the 15th is one of the trickier ones to get. This mod builds on all of the original concepts of the game and is free-to-play as its own game on Steam. This means that players of the mod still have access to a third portal and the ability to travel into a separate dimension/timeline.
While having the extra portal can be very useful, it can also muddy how to successfully make a way through the puzzle. The third portal, a green square doorway-like opening brings players into a separate timeline where all of the rooms are partially destroyed. This can help players get past certain blockers in the other dimension and open up completely new pathways.
How to Solve the Puzzle of Chamber 15 in Portal Reloaded
For Chamber 15 in particular, there are quite a few steps but with minimal use of the third green portal.
- After entering Chamber 15, head through the blue miasma door on the left.
- Place an oval-shaped portal at the left end of this room for the laser to shoot into.
- Create a green portal anywhere in this room to leave it in the other timeline.
- Create another green portal outside of the room to head back into the previous timeline where everything is working.
- Above the window to the right of the blue miasma doorway, create a secondary orange oval-shaped portal. This will activate the receptor on the opposing wall.
- Head through the green portal once more and create another one of the orange oval-shaped portals on the wall opposite the right-hand window inside the left room. This will activate the cone on the floor in this dimension/
- Go through the green portal again to the working room to see that the portal has not moved in this dimension. Walk over to the outlined square on the floor near the wall that players face when they first enter the room.
- While standing on this piece of flooring, turn to face the cone on the floor and place the green portal on the wall behind it to activate the cone. This will lift the four tiles the player is standing on to a previously inaccessible ledge.
- Press the red button on the right side to receive a cube. Take the cube over to the drop-off point on the other ledge and head through another green portal.
- In the ruined timeline, take the cube into the left room. Create a green portal in this room and bring the cube through the portal. Place the cube in view of the miasma doorway at an angle to send the laser through the door and into the other floor cone.
- Place the orange portal somewhere outside of the left room and head through the blue portal to gain access to the main room without needing to head through the green portal again.
- Head up the new stairway provided in the clean world. Stand above the cube, face back towards the left room, and place the orange portal at the top of the wall. This will activate the last of the reactors.
- Grab the cube from its station and place it on the giant red button below the reactor. Players will then be able to exit the chamber.
Portal 2 is available on Xbox 360, PlayStation 3, Linux, and PC.