The individual game is good and it is possible to make progress without using real money BUT the group challenges are a waste of time as the developers refuse to put players into groups ie.placing the top 100 into a group, then the next 100. I asked the developers about this and they stated that the top players should not be penalised but they're already playing against each other now so how would it penalised them? It would make it fairer and you would be competing against similar level players