Meet KenKen! Quite similar to sudoku, but you need to also adhere to basic mathematical operations.
Here are the rules:
- The only numbers you may write are 1, 2, 3, or 4.
- No numbers may appear more than once in any row or column. Also, all required numbers must appear in every row and column.
- Each "cage" (region bounded by a heavy border) contains a target number in the corner. If there's more than one cell in the cage, the target is also accompanied by an arithmetic operation. You must fill that cage with numbers that produce the target number, using only the specified arithmetic operation. Numbers may be repeated within a cage, if necessary, as long as they do not repeat within a single row or column.
- In a one-cell cage, just write the target number in that cell.
Below are two KenKen 4x4 puzzles, each worth 10 Hoots. Solve them and send me the links over HOL Forum message by June 30th, 11:59pm HOL time to earn 20 Hoots.