Corral puzzle, aka Cave aka Bag etc.
(Yes, from nikoli.)
Short rules: draw a loop along the grid lines; each numbered cell is in the loop and the number denotes how many cells can be seen vertically or horizontally from that cell, plus the cell itself. Stealing link to MellowMelon’s long rules.
Obviously, like I decided with my normal ramblings many years ago, I should stop any pretense of making these with any sort of schedule.