Logic Masters Deutschland e.V.

Quick Quiz:

What's the one's digit of each of the following multiplications: (select with mouse to reveal answers)

1. 2*5*3*4*2*7*9 = 0
2. 3*7 *4 = 4
3. 2*3 *8 *2*3 *2*3 *2*3 = 8
4. 7^10 * 8^10 *4 = 4

The Rules:

1. Normal sudoku rules apply.
2. [Numbered Rooms] Digits outside the grid, some of which must be deduced, are numbered rooms clues - and must occur in the xth place in from the direction of the clue where x is the digit in the cell next to the clue.
3. [Sandwich Products] Numbers on the outside of the grid are also the *ones digit* of the product of the digits in the cells sandwiched between the 1 and 9 in that row or column.
   • E.g. The row 281369547 would have a clue of 8 on the left because 3*6 = 18 and the 1's digit is 8. Notice that 8 would also be the valid numbered room clue as it's in the 2nd spot in.

The Puzzle:

Try it on F-Puzzles or CTC app.