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OTC was made available in early access on Feb 12th, 2014 and launched in a completed state April 28, 2016. Features to be added during the early access process include multiplayer matchmaking, leagues, and ladders.
Up to 8 human or AI players must take advantage of fluctuations in the market prices of resources by buying or producing low and selling high. The game ends when one player buys out all shares of their competitors' stock.
Some resources can be gathered directly from the map and others can only be produced by consuming other resources.
Any resource can be bought or sold freely on the local market (among traders on mars) for the going rate. The price of a single resource will increase as it is purchased, and decrease as it is sold back to the market.
Once a player has sufficiently advanced buildings they may dispatch shipments a resource into orbit to the offworld market. The price of resources on the offworld market is independent of the local market. (usually 10-20x the local price)
Various underhanded methods of sabotage are available for purchase at the black market.
Each player's company offers a total 10,000 shares of stock to interested buyers and may be purchased in increments of 1,000. If a single player owns all the shares of another company, they assume control of that company's buildings and assets.