Logic Masters Deutschland e.V.

Author: 真笑(洪卫华), from China, this question comes from his personal blog.

Bachelor(光棍) Sudoku

The easier version: click to Bachelor(光棍) Sudoku（1）

1. Classic Sudoku rules apply;
2. The prompt numbers or the equal sign indicate that there are only two numbers form a pair of consecutive numbers in the four digits;
3. The prompt number is the remaining two nonconsecutive digits in the four digits, and the equal sign means that the remaining two digits are equal in the four digits;
4. All possible numbers or equal sign are given.

!!!Note: The marked numbers and other two digits are all nonconsecutive in the four digits!!!