You need to sprint across the tops of buildings to kill enemies and save your city. As you start the game, you start sprinting towards the right side of the screen. You can't stop moving, so you just need to be careful about jumping. To jump and get on higher buildings or avoid gaps, push the Z or X button your keyboard. If you want to run faster, you can! Move your mouse to the right side of the screen, and your character will run even faster to that side of the screen! Enemies will get in your way, and you have to get rid of them. Click to shoot them!