Bah, if you want a challenge, play against six computers at the same time (all against you). If you can win that, then you're ok.

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Pick a map with the bases close together and take one of your workers, hotkey it, and way point it from the first base, to second base and so on and all the AI workers will follow you for a while, just check in every now and then and re-waypoint the worker again while building a good amount of units (zerg works best in this situation).