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Ok, first thing is first: M to mute, N to unmute P to use, U to unpause SPACE TO DE-SELECT Build 12 kinds of towers to defend against invading spaceships in 2 game modes. In the first mode, prevent all the ships from reaching the bottom In the 2nd mode, protect the gem at the center. This is not a build your own maze tower defense game, it is different from that. You only have 5 gems of which you can build ultimate towers with.