In issue @@@ of @@@, Sanders published a new type of puzzle, called ‘hidden numbers’.

I must confess that the puzzle was too hard for me, though in the future I may give it a try again.

In this post I present a simplified version.

1. The numbers 1 to n have been hidden in a square grid.

2. Yellow areas give the sum of the hidden numbers in row and column of the yellow square.

From here there are two ways to increase the difficulty of the puzzle (aside from increasing the size):

a) Put more than one hidden number in a row and / or column. This is what Sanders did.

b) Sum only the first number visible in any row or column. Any number, including the numbers in yellow squares, block the line of sight for any numbers behind them.

New puzzles are published twice a month on Fridays. Solutions are published after one or more weeks. You are welcome to discuss difficulty levels, variations and alternate solutions, but plz. don’t publish the solutions.