Logic Masters Deutschland e.V.

"I made a su-do-ku today, and this is the strongest one ever! I'm gonna tell you the rules! Every line, every row, every box, has the numbers 1, 2, 3, 4, 5, 6, 7, 8, 9, 9, wait, I think I counted wrong? Who cares! Every number can only appear once. I also wrote some c-al-cu-la-tions on the paper that are definately correct! You just have to write the right answer on the other side of the equals sign and the su-do-ku is done! I even used aroows to shorten the math problems! The number in the circle is DEFINATELY the sum of the numbers on the line, I checked it already! And this X-thingy... as long as both sides contain a 9, NO, I mean the sum is 9, NO, I mean... it's just like that! You have to come try my puzzle!"

sincerely yours
Cirno

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Here is the correct translation for Keine-sensei's rules:

• baka sudoku rules: Every row, column, and box contains the digit 9 and eight of the nine digits from 1 to 9
  
  
• No two rows, no two columns, and no two boxes may be missing the same digit.
  
  
• baka arrow: If the number in a circle is 9, the digits on an arrow must not sum to 9. Conversely, if the number in a circle is not 9, the digits on an arrow must sum to 9.
  
  
• baka XV: Digits separated by an X sum to 9, but if a 9 is present on either side, the X is ignored.
  

• baka equation: There are addition and subtraction equations on the board. If an equation's result is 9, the number after the equals sign cannot be 9. If the result is not 9, the number after the equals sign must be 9.

The areas outside the central 9x9 grid do not have to be filled with numbers.

In case of ambiguity, the symbol between R9C1 and R9C2 is a minus sign."

This is my first time making a puzzle. I hope you'll have fun and share your feedback.
Happy cirno day!