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In most other games, the first episode was shareware. In this game however, there is just one episode to select and a "Shareware" below it.

Storywise, should the shareware be played first, or is it separate from the main game. Or are those levels already in the main game, so there is no need to play them separately?
This question / problem has been solved by triockimage
"Shadow Warrior is divided into two episodes: Enter the Wang, comprising the first four levels, which was released as the shareware version of the game, and Code of Honor, comprising the subsequent 18 levels, which together with the first episode forms the registered version of the game."

http://www.giantbomb.com/shadow-warrior/3030-17746/
Thank you.