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The game is copyrightable, of course.

(and words, well, of course. Books are words, right?)

Game rules in general are not copyrightable.

There were some lawsuits about Tetris. You can make a game with the rules like Tetris. But you cannot name it Tetris, and you cannot make it look too much like Tetris.

The game mechanics aren't copyrightable, but this word-for-word copy of the game rules is copyrightable.

The HTML, CSS and JavaScript layout out the page is also copyrightable, and the taken-down site is a direct copy of this

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