As mentioned yesterday in my wrap-up post, the Surprise Sudoku for the SudokuCup was rewritten to mark all possible groups and also made easier. This is the original puzzle for those who are interested. Note that the rules here do not require that all instances of a particular pair/quadruple to be marked.
Rules: Write a single number from 1 to 9 in each cell such that each number appears exactly once in each row, column, and bolded 3x3 box. There are some symbols that touch either 2 or 4 cells; the same digits must appear in the cells touched by a symbol each time that symbol occurs, but the digits can appear in any order.