Also Check out my latest scenario: RS13

This scenario will having a major rebalance soon

The scenario is good fun, balancing infectivity and lethality can be quite tricky with the high mutation chance. I found that I had quite a lot of DNA though, so scaling down the amount of infectivity, lethality and severity you get from evolutions might make getting more upgrades matter more. I have to say though, the scientific inaccuracy is 0/10. If science is really important to you (like me), it might be a little hard to see all the details the scenario gets wrong. Short review: Good gameplay, few problems, bad science 6/10.