You can unlock Duke and Shuko in the game:
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Run the game in CONSOLE mod
When you are in character selection scree
Take the pointer to Billy and stay for 5 second
Then take the pointer to Marian and stay for 5 second
Then take the pointer to Chang fu and stay for 5 second
Then take the pointer to Jimmy and stay for 5 second
You will hear a bingo sound and the bosses appear
Select the