Free players can only use gold to achieve the goal Double Points at the end of the month.
Free players can also accumulate golds (only partially, however, compared to VIPs) so when they decide to make a VIP subscription they will not have to start from scratch in accumulating them.
For more information on the VIP subscription or to make a subscription, you can click on the following link: VIP subscription
For more information on the VIP subscription or to make a subscription, you can click on the following link: VIP subscription