Looking for something to keep your brain in shape? Woodoku Online is a super addictive and challenging puzzle game that mixes Sudoku classics with blocks of wood. It all has to do with geometry. You need to place the evasively shaped blocks onto the grid in such a way that all of the rows and columns add up to the same number. It sounds easy, but it gets super tricky as you progress through the levels. So get ready to think as hard as you can and good luck!