Shoot and kill all the to progress to the next level. Aliens can have more health than others, can shoot differently and give you different points too!

And if you're lucky, you might see the who steals a bit of your barricade if you let him!

If you're even luckier than that, you might even find a who will get you a load of points and will kill a random selection of aliens if you shoot him!

Each alien shot gives you a chance for a special drop:

• Gives you an extra life
• Restores your barricades
• Increases your bullet speed
• Increases your bullet frequency