2. Aliens have invaded Earth! The aliens are disguised as human beings and the only way to tell an alien from a human is to read your scanner. You have only 10 seconds to detect an alien before the alien decides to eat you. Inject the alien to kill it and this will leave the human body intact. FEELING BRAVE? THEN CLICK THE MOUSE TO CARRY ON…

3. LOCATION: Chester - City Walls ALIEN SCANNER a = 2 b = 4 a + b = 7 INJECT HUMAN FORMULA INCORRECT? ALIEN

4. LOCATION: Chester Cathedral ALIEN SCANNER a = 2 b = 4 2a + b = 8 INJECT HUMAN FORMULA INCORRECT? ALIEN

5. LOCATION: Chester – Frodsham Street ALIEN SCANNER a = 2 b = 4 3b = 12 INJECT HUMAN FORMULA INCORRECT? ALIEN

6. LOCATION: Chester – Deva Bridge ALIEN SCANNER a = 2 b = 4 2a + 2b = 13 INJECT HUMAN FORMULA INCORRECT? ALIEN

7. LOCATION: Chester – Roo Dee ALIEN SCANNER a = 2 b = 4 3a = 6 INJECT HUMAN FORMULA INCORRECT? ALIEN

8. LOCATION: Chester - Castle ALIEN SCANNER a = 2 b = 4 b 2 = 8 INJECT HUMAN FORMULA INCORRECT? ALIEN

9. LOCATION: Chester – Bridge Street ALIEN SCANNER a = 2 b = 4 a 2 = 4 INJECT HUMAN FORMULA INCORRECT? ALIEN

10. LOCATION: Chester - Rows ALIEN SCANNER a = 2 b = 4 2(a + b) = 12 INJECT HUMAN FORMULA INCORRECT? ALIEN

11. LOCATION: Chester - Cross ALIEN SCANNER a = 2 b = 4 5a + b = 12 INJECT HUMAN FORMULA INCORRECT? ALIEN

12. LOCATION: Chester - Library ALIEN SCANNER a = 2 b = 4 a 2 + 3b = 16 INJECT HUMAN FORMULA INCORRECT? ALIEN

13. Aaaaaaargh! This stuff is not good for humans. Please be more careful. CLICK TO TRY AGAIN

14. Congratulations! You have successfully identified all ten Aliens and saved Earth. (or at least Chester) Start Again

15. TOO SLOW HUMAN. I’M HUNGRY! Click To Try again