If it is a game, there would appear to be rules:

1. Entropy - i feel the physical pains of old age

2. Desire - to extend (sex), connect, gain/exercise power

3. A need to consume biological matter (and oxygen/water) and excrete it

4. Limited resources

5. Limited knowledge

6. A need to sleep

7. Environmental restrictions (climate - need protection against it)

8. Gravity, speed of light

9. A limited array of senses

10. Reasoning

And others - i'll add them if i think of them!