I think I know how it works... you get 5 gems in the top round you've ever reached, don't you? So... if one week you explore the next round just in case, to see the prize you get, you get a blue voucher but oh! bad luck! next week you'll need to reach that level again to get 5 gems! First of all, if I'm right, is there a way to take back that 'top level'? Maybe doing less next week? Again, if I'm right and there's not a way... it's really annoying, 'cause your top score may be an unusual occasion that you're unable to get again!!!