See quote below
So we have to reach 100% and ideally fast. Great but what is 100%, is it 1 balloon donated per active player or a zillion balloons donated per active player. The End of the World event was fun and I enjoyed doing it for the sake of doing it. I also made a lot of friends along the way, but, the way BB implemented the event and the post event feedback was rubbish.Each game world has the same task: reach 100% as soon as possible.
The faster your game world reaches 100%, the more rewards you get.
It will be possible to track the current progress through a button below the avatar interface.
During the first phase of the event, each game world fights alone for its rewards.
Rewards for the first phase: Gems and Hired Troops. The amount of these rewards will depend on the performance of your game world (how fast it reaches 100%).
This time BB ask us to reach 100% with no idea what 100% is. Its just another huge resource sink to take resources out of the game without explaining the rules. Its like asking me to run a race without telling me how fast to run or how far to run - its a little unfair in my opinion.
Needless to say, I will do some of the stuff for the fun of it but I am not expecting the same effort as last time in pulling together to achieve an unknown goal!