Another game you can play at Arkadium (6)
I believe the answer is:
sudoku
(Other definitions for sudoku that I've seen before include "Numerical puzzle" , "numbers in boxes" , "Numeric puzzle" , "Popular logic-based puzzle" , "Numbers game" .)
I believe the answer is:
sudoku
(Other definitions for sudoku that I've seen before include "Numerical puzzle" , "numbers in boxes" , "Numeric puzzle" , "Popular logic-based puzzle" , "Numbers game" .)