You can access instructions in-game.
I made this a year ago for my GCSE coursework and got an A* for it. The object of the game is to get as many points as possible. Level will be complete once the time runs out. Mutant Rats will drain your health with their minds and sometimes, the high radioactivity underground drains your health too when no rats are present. Further information such as instructions and tips are integrated within the game. Remember to post your high score into the comments section. Enjoy!