Dream Of a Square

One day, the two squares, who had a dream while sleeping, tried to wake up from their dreams, but couldn't wake up in the end. All the two squares could do in that dream was to open the door by pressing a button appropriate for their color and climb up an unknown place. Even if I climbed all of it, I didn't know if I could wake up from my dream, but I had to, so I decided to go up there.