How do I get through The Final Hurdle with 3 cubes?

Question

How do I get through the room The Final Hurdle to the point pictured with all 3 cubes?

(picture taken from There are 4 slots but I have 3 blue cubes. How do I open this door in 'The Final Hurdle'?)

Answer 1

First, put one cube in the slot that opens the first door Then walk through the laser that opens the red doors Next, block off the other laser with the two blocks you have Then, walk past and take both blocks Use one block to prop up the last door Use the other block to jump over the laser that you previously blocked off After you are past the laser, grab the block and use it to prop up the first door Then grab the first block, and run back through, grabbing each block as you pass it. Success!