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You'd be much better of by declaring regions (x1-x2, y1-y2 square) and just store the instance-fields (where the player meets a new instance)
Also can I get some estimate on how long it would take to make such a game and how many people would be needed. Would a 2, 3 man team and a few months be enough or would I need a 20 man team and a year or 2?