dont play this crap, they are the worst.
They had in a expansion a bug that gives ppl unlimited gold, and earth unplyable so namy time, then they make a reward that gives 5k gold for beat earth, but 15 august 2017 they changed it to 500 gold only.
And they have events but on this events the most gold user is the winner, and ofc to many ppl with unlimited gold or 5000 gold and they pretend that you play here in a fair state with this amount of ppl with unlimited gold and you with 500. Just making things without spent gold i got rank 1230.(crap)
( i spent like 340 gold that was all i got for beat earth and only got 500? )
bah they make this game a fu ♥♥♥♥ and im playing it years ago, but definitely i will deletete it and never play this another time

edit: unlimited gold users still ingame, now they give less gold for beat the planets(just one time give gold), they still allow ppl abuse of that gold on events... no sense at all if a noob free gold user is on the event they just use it to get first ranks... there is no way events with ranks are won just for the one that pay most gold, atleast dont spent a cent buying gold...they give unlimited gold to some lucky noobs