Erich's Holiday Puzzles

Go in with 2011, and go out with 2012. You may pass through an operation several times, but not twice in a row.
2011 Erich 2012 2012
  Please share the answer.

Tip of the dayA Sudoku Puzzle Needs at least 17 Clues. 
Gary McGuire: I know you have posted and written about Sudoku. You might have some interest in the minimum number of clues problem, so I write to let you know that we have completed the exhaustive search for a 16-clue Sudoku puzzle, and the result is that none exists. Therefore we have solved the problem, and 17 is the answer! There is no 16-Clue Sudoku.

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