#159: Row Sums Numpoint

 made on April Fools Day 2022

https://tinyurl.com/yckvspu7 

This puzzle type was invented by thejonymyster.

Write a positive integer into each cell of the grid so that every row or column containing a number n must contain every positive integer below n (e.g. if a cell contains a 3, it must be on the same row as at least one 1 and one 2, and on the same column as at least one 1 and one 2). A number with an arrow in its cell must see exactly one copy of itself in that direction (e.g. if a cell contains a 2 and a downward arrow, there is exactly one 2 below it in that column, no more and no less).

Variant rule: Numbers on the outside provide the sum of their row or column.