Difficult Puzzles and Studies!

Difficult Puzzles and Studies!

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Here is just a small selection of some tricky and intriguing puzzles I've come across during the years, from newspaper articles, chess magazines, my own games and online sources. 
The puzzles are of varying difficulty, but some are very hard (for me, at least)! In some cases move orders may be interchangeable. 
Please let everyone know how you found the puzzles in the comment section. Which is your favourite puzzle? (Number 12 is my favourite happy)
Here's a simple one to start you off!
1. (Composed) 
2. (Composed)
3. (Vincent Keymer vs Magnus Carlsen 2024) 
4.(Composed) Find the quickest mate:
5. (Puzzle Rush)
6. (Puzzle Rush) 
7. (R.Schulder vs Samuel Boden 1853)
8.(???? vs Markcheck 2024)
9. (Henri Rinck 1903)   
10. (Magnus Carlsen vs ????)
11. (Kubbel vs 'Study' 1917) 
12. (????) 
13. (Nodirbek Abdusattorov vs Anish Giri 2024) Black is threatening Rxc2. Can you see White's cleanest and most beautiful mate?
14. (Daniil Dubov vs Anish Giri 2024) 

15. (UK National Puzzle Contest [entry puzzle] 2024) White to play and checkmate in 2 moves versus any Black defence