https://sourcing.games/game-1/game-1-xc4ya/

You are prompted to go to a website to get the code from.

Upon entering, this is the page:

image.png

When highlighting everything, we get a clue:

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Opening inspect element, and browsing through the HTML gives us the answer.

image.png

Pretty straightforward.

The code for Game 1 - 01 is: games42