Game stages

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Pre-Alpha: the first stage of development, if a previous game was made that had a similar engine to the one going to be used, it uses the previous games engine, the engine controls everything in the game;
Alpha: Similar to pre-alpha, but most major levels and maps are completed, some slightly revamped textures now exist; 
Beta: Very similar to the final stage of the game, usually the stage where things in the game are given there semi-final test; 
Delta: A very short testing stage;
Final Product: This is what well pick up in stores and will enjoy.