The rules are:
1) Normal sudoku rules apply, with ANTI-KNIGHT move constraint
2) Central 3x3 must form a MAGIC SQUARE (each row, column and diagonal of the 3x3 box must sum to the same amount)
3) Standard KILLER SUDOKU rules (cages cannot contain repeated digits)
4) Standard SANDWICH SUDOKU rules (number outside the grid shows the sum of digits between lowest and highest digit in the row/column)
5) Standard THERMO SUDOKU rules (digits need to increase starting from the bulb)
I hope you like the puzzle.
Thanks
Puzzle is available on Penpa-Edit
Solution code: 2nd row and 8th Column
on 4. December 2021, 16:02 by cdwg2000
Very nice!
on 7. January 2021, 19:02 by hellan
Thank you, Bankey :)
on 7. December 2020, 18:25 by Bankey
Very interesting combination of different rule-sets. Good fun. Thanks, Hellan.
on 16. June 2020, 17:42 by hellan
@Rotstein, thank you so much :)
on 16. June 2020, 17:06 by Rotstein
@hellan it's okay, it happens, very nice puzzle :)
on 16. June 2020, 16:48 by Statistica
Very nice! Congratulations.
on 16. June 2020, 15:34 by hellan
Sorry about that haha, new to all of this (my first puzzle) so I messed up the code. Well done anyway
on 16. June 2020, 15:21 by SirWoezel
Heh... I already closed the Penpa-edit window. Oh well, I'll do it again. I know where to look now!
on 16. June 2020, 15:11 by hellan
changed the description for the solution code (it said 7th column, it should have said 8th). Sincere apologies for anyone that solved the puzzle. Thank you for your input and well done
on 16. June 2020, 11:51 by Madmahogany
Same here, I think the solution code may not be correct
on 16. June 2020, 08:32 by Rotstein
So, I solved it and double checked and there's no mistake, but it's saying the solution code is incorrect, maybe there's a typo error in the solution code, can you please verify?
on 16. June 2020, 02:19 by hellan
added tags
on 16. June 2020, 00:36 by hellan
changing difficulty setting
on 16. June 2020, 00:30 by hellan
Added Name to the puzzle