#FunBrainyApps showcase of z3DPicto9x9: #sudoku requires you to place each of 9 numbers in only one col, row, and square. These variations have a randomized widget set in place of the numbers. Master a set of 9 and then turn your attention to z3DPicto16x16 using a set of 16 widgets and taking a little bit longer to solve. Next up is z3DPicto25x25, a set of 25 and possibly taking a couple of hours to solve. Now brace yourself for z3DPicto36x36, expert level and typically around 6 hours to solve.