We have learned about Suduko (4×4 and 6×6) in P1 and P2. It is time now to try out an even more challenging puzzle , Ken Ken (which looks very similar) in P3 next year.  We will start off with 4×4 Ken Ken Do try out the following online Ken Ken:

(1) MathDoku

Start with 4×4 & ‘easy

(2) CaluDoku