Number Grid

Five-by-five grids with ten equations. Numbers range up to 100, and 6–10 cells are blank — a mix of number and operation blanks. Each equation is longer too: five operands separated by four operations, so you often need to compute intermediate values to figure out what fits.

At this size, working from both ends of an equation becomes essential. If you know the starting number and the final result, the middle operations and values are heavily constrained. Expert grids take 8–15 minutes and are suited for adult puzzle solvers who enjoy KenKen or Kakuro-level challenges.