I'm gonna make it my personal mission to bring every single one of the cubes with me through the game
40 minutes later, I can call Mission Cubepossible a success! I got all four cubes from the main levels to the end. Getting the first two through the room with the two sliding yellow blocks was the tricky part. The rest was a breeze. With cube, all things are possible.
Are there any secret levels or sections with more cubes to rescue that I need to know about?