How to access old Puzzle of the week?

What do become old Puzzles of the week (POW) ? I saw some were moved to “Training” section ; is it the case for all POW ? Else is it possible to access old POW ? Is it possible to access those I already solved ?
Thank you

It’s kind of the other way around.

They always have been in the Training section, and just happened to be featured as POW for some time.

(apart from the rare case when an multiplayer or optimization game was featured, in which case they’re in a separate section, but still, available independently of POW)

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Nice ! Thank you for this clarification