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Normal Sudoku rules apply.

Slitherlink rules apply – you need to draw a single loop through the edges of the sudoku grid that doesn't touch or cross itself. Some of the sudoku numbers will be slitherlink clues "0", "1", "2" or "3" meaning that many of the edges of that cell are part of the loop.

Numbers 1, 2 and 3 are just corresponding slitherlink clues.
Number 4 is a "2" clue in green boxes and at least "2" in blue boxes.
Number 5 is a "2" clue in yellow boxes.
Number 6 is a "3" clue in the central box (box5) and also a "0" clue exactly three times in the grid.
Number 7 is a "1" clue in the middle row of boxes.
Number 8 is always either a "1" clue or a "2" clue.
Number 9 is a "1" clue in the middle row of boxes, a "1" clue in blue boxes and in yellow boxes it has three different clue values that are ascending from top to bottom (i.e the value in box3 is the smallest and the value in box7 the largest of the three).
Only numbers larger than 5 can be a "0" clue.
CTRL + z CTRL + y Erase elements that belongs to the selected mode Erase problem or solution grid

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Mode: Surface