Daily
Kendoku/KenKen Puzzle
Updated Every Night At Midnight.

KENDOKU puzzles are similar to
SUDOKU puzzles in that you must place a digit in each cell so that
each row and column does not have any repeated digits. The puzzle
is divided into domains, and each domain contains a number which
is the result of performing the given mathematical operation on
the digits contained within the domain. Each puzzle has a single
unique solution, and no guess-work is required to solve them.