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I hate to keep posting here asking for help, but…

I am stuck on the puzzlemadness.co.uk Daily Tough X-Sudoku Puzzle for 1 June 2023. Here is where I am: http://pairofdocs.net/wp-content/uploads/2023/06/SudX_stuck.jpg. I have looked for the basics, hidden pairs, hidden triples, skyscrapers, etc. but have found nothing. Please suggest what I should try next.

From the puzzlemadness.co.uk site:

What you already solved:

When I compare this to the original you forgot to mention the given 5 at R6C2.
Now the only possibilities for another 5 in block 7 are at R8C1 and in block 9 at R9C7.
The same way you discover in block 6 that R4C8=5 and in block 3 that R3C9=5.
Continue now for other 7 & 9 singles.

Without the extra clue mentioned by urhegyi the puzzle has 10 solutions. With the extra clue it is very easy.

Leren

That's pathetic - and I thought I checked to make sure everything was okay.