Lets start with an unrelated self-plug – https://www.gmpuzzles.com/blog/2021/08/japanese-sums-by-prasanna-seshadri/ Check this out!
Now to today’s puzzle. This is a “fresh” puzzle, i.e. only 2 or 3 people have seen it before.
Rules – Shade a right triangle in some empty cells, each of which occupies exactly half the cell it’s in. Each unshaded area must be rectangular in shape. A number in a cell represents how many of the (up to) four cells orthogonally adjacent to the clue contain triangles.
Penpa link to solve: https://git.io/JRCdn (Click+drag slightly to a corner to draw in that corner’s triangle, just click for dot)