I reached the final level as well..
But of all the missions,the 6th one was a bit tough compared to the rest,but the final one is almost impossible to finish.
First four turns I managed to rule the others as they were weakened by the tribute I asked. But then the suddenly become much stronger..
I dont know how to proceed with this. How in the world will be able to launch that spaceship without surviving the three Titans around me?!!