Shop & credits
Credits are what fund Minethings. They can be bought in the shop, and used to buy and rent mines, and to get special bonuses.
Credits are what fund Minethings, and can be used to purchase things in the shop. You can buy credits by going to the "Shop" tab, and clicking the link "Buy More Credits".
There are other ways to earn credits besides buying them. They are A) By submitting artwork that gets accepted. You will receive 40 credits for each piece of artwork you submit that gets accepted B) By referring others to the site using your unique link found by clicking the "Facebook" tab. You will receive 1/3 of all credits the miners you referred buy.
The shop is where you can buy and rent mines, purchase inventory expansions, and purchase battery extensions for credits. Mines: Mines can either be bought or rented in the shop. Bought mines will remain yours forever unless you sell them or get reset. You can also buy mines from other players for gold, although buying them for credits is much faster and easier. Rented mines cost 1/10th the cost of buying mines, but only last a week, and can't be sold for gold. The cost of buying a mine depends on the mine. Inventory Expansion: The inventory expansion permanently increase your inventory limit by 25, with a maximum inventory limit of 250. Your inventory limit starts at 75, and it can be very useful to increase this to be able to own more items. You can also buy warehouses (a gadget) for gold from other players, but these are temporary and only increase your inventory limit by 100. Each expansion costs 9 credits plus 6 credits for each one you had purchased beforehand. Battery extension: Will temporarily increase your battery life by 10 days, which is helpful if your going to be away from a computer for awhile, and don't want your mining robots to stop mining. Costs 9 credits each, and is stack-able.