What are your favorite PC Puzzle games?

[Almaz_99_kras]

Tetris

 

[tahirpadela]

tetris

 

[Brian Boru]

Please post helpful answers, to help other readers decide if they might like your favs too.
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Note: If someone has suggested the game you were going to say, like for instance Tetris, just like the post, no need to comment

This thread has run its course, thanks to those who posted helpful responses.