once you beat the game castle fairfax will be available to buy for 1,000,000 gold
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After you have beaten the game you can then purchase the fairfax castle.
Buy "Castle Miner" to obtain this code.
in the castle buy on the guard in front of themember's room the guard with the exclamation on top
you have to buy alien hommid sepretly which costs about 800 points and get at least 1 achievement to unlock the alien on castle ccrashers.
You can make them provided you have the smithing level, or you can buy form the Bob in Lumbridge, near the castle.