While playing, hold the Command and Shift keys and type "0wpn"
Hold [Command] + [Shift] then type anumber that corresponds to a weapon, followed by wpn.
Hold [Shift] + [Space] and type prime.
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At the title screen, hold the Command and Option keys and click on New Game. You will then be able to select a level from 1-40.
Hold [Command] + [Option] at the mainmenu and choose the "New Game" selection.