Press the green flag to begin. Once the game has finished drawing the level and then a green and a red square pop up, you are free to play the level. You control BOTH squares at the same time and they both move simultaneously. Use the arrow keys to move and press the spacebar to reset. Your goal is to get both of the squares to their goal AT THE SAME TIME. If one square falls off, goes in the or one gets to the goal before the other, you lose and the level resets.
All credit for @JereTheJuggler for the project. I just made it work in Scratch 3 Press "L" to select level.