Hello, press space key to have your shield. The blue square must die to win. It has got 100 health. If you want him to die, he must touch the red square or the green square with the cross. The black green and white square can cross the solid but if he touches the shield or the zero in the middle he dies. The green square with the cross dies if it touch the solid.
See more project on my studio : https://scratch.mit.edu/studios/35963832