At least 2 prototype versions exist.  The earlier one, dated 11-21-83, is a very early version that has no title screen or smart bombs, but offers infinite lives, and has different warp and planet explosion effects.  The game starts automatically and waves alternate between planet and space, with each wave consisting entirely of one type of enemy (or humans).  The later version, dated 1-5-84, is nearly complete, but suffers from slowdown at times. Its possible that programmer Steve Baker has a more complete (or possibly finished) copy of this game, then the version currently available.  {Steve Baker}


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