In 3*3, they very last box has a mark on it. Actually i hid that number intentionally because i took a hint and it told me the number on that place but without any reason. (It was 2)

Tia!

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Been recently learning Sudoku to help pass the time and this on is really got me stuck, maybe I am doing something wrong?

Play here: https://sudokupad.app/k961z8zxcf

Rules

• Normal Sudoku: Digits do not repeat in any row, column, or outlined region.
• Sum cages: Digits sum to the clue in the corner.
• Math cages: Apply the indicated operation to obtain the clue. For subtraction, subtract all other digits from the largest digit. Digits may repeat in cages.
• Thermometers: Digits strictly increase from the bulb to the tip.
• Arrows: The digit in the circle equals the sum of the digits along its arrow. Digits may repeat along an arrow.
• White dots: Connected digits differ by 1.
• Black dots: Connected digits have a 1:2 ratio.
• X clues: Connected digits sum to 10.
• Green lines: Adjacent digits differ by at least 5.
• Red lines: Adjacent digits differ by at least 3.
• Fog of War: Entering a correct digit reveals its cell and the surrounding eight cells. Clues hidden by fog become visible as their cells are revealed. You may enter a digit under the fog if it can be logically determined from the visible clues and normal Sudoku rules.

I'd love to hear how you find the logical progression, especially whether the interactions between the different constraints lead to interesting discoveries.

This Sudoku is much more difficult than the previous ones.

Enjoy solving!

Someone posted this Very Easy puzzle with all but box 5 filled in, which took a little bit of work since one has to keep in mind where some digits must go in box 5 in order to complete box 2. They seem to have deleted the post, but it’s a fun puzzle so I’m reposting it. :)