Number grid puzzle from geocaching cache

[Mixer]

Greetings,

Found this grid from Internet. There was no hint if this was a puzzle but I pretty much sure that it is. Has someone seen this kind of grid before? If so, how to solve this? The link to the grid is:

https://www.geocaching.com/geocache/GC6FQYC_pvm-6-chimney

 

[jedishrfu]

Not sure of the solution but I found this website:

https://www.puzzlemix.com/Calcudoku