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The Orange Box: Portal Hints
How can I get past this room?
1 of 4: By jumping up onto the ledges.
2 of 4: Since you can't do it by yourself, use your companion cube.
3 of 4: Set the cube on the floor next to the lowest ledge, then jump onto the cube, and then onto the ledge.
4 of 4: Without falling off that ledge, pick up the cube again and set it next to the higher ledge so you can jump up onto it.