Bejeweled 2 on OurWorld?

I took a challenge that said that I had to earn 500 gems by playing Bejeweled 2. But, I don't know how to do that. Help!!!!|||But mine dosent tell me i have to earn 500 gems thats so weird 0_o|||I don't know about the 500 gems but when its says make a 9 set it means connect 9 of those Jewel thing on the game