Gold Forge (left) and Gold Furnace (right) in the Shop
Gold Furnace is a 3x3 building that can produce 
for the player so long as it is active on the player's rooftop.
History
Gold Furnaces were introduced to the game in February of 2015 and were available for purchase through the Shop for the price of 3,000. At the time of introduction, players were not limited to the number of Furnaces they could purchase. On June 16, 2015 they were removed from the shop and Kobojo stated that they were being re-evaluated and would return to the shop. At the end of June of 2015 they were reinstated, with the player being limited to being able to purchase three of these for from the Shop. They have since been removed from the Shop and have only been made available through limited sale periods, for actual cash. Any Gold Furnaces the player may have purchased prior to the limit do not count toward the three-Furnace limit, nor do any Furnaces that may be bundled with future packs that may be sold.
Function
An individual Furnace can produce 50 every 2 days. Once production is finished, it will not resume production until the player collects the existing .
Acquisition
As of Jan. 17th 2019, these are not available for purchase with . However, a total of 8 Gold Forges and Furnaces can be found as rewards on certain Mutants Bingo cards, and are occasionally offered in a one time offer(for 9.99$) when a player levels up.
There is no maximum number a player can have in play at a time; however, the limited methods of acquisition restrict the number they can own.
General Trivia
- If properly timed, a player can net approximately 2,250
per month from a set of three Furnaces. - A single Gold Furnace must be in operation for a minimum of 120 days before the player can turn a profit from it (i.e., it pays for itself).
- It is speculated that the removal of the item from the shop was because players had figured out that the ability to purchase multiple copies of Gold-producing items with was a way to get around having to pay actual money into the game once you hit a critical point of Gold production. KBJ removed the item to prevent further abuse before they could retool the limit on purchases.