Logic Puzzle #5 - Stone Stairs

Stone Stairs

Another old puzzle of mine. This stostone is almost fully rotationally symmetric - a 4 in the bottom right is the only difference. I am still a bit surprised this ended up unique!

Rules and link

Shade a single group of orthogonally connected cells in each region. Shaded groups may not share a bold border. Regions with numbers must contain the indicated amount of shaded cells. If all of the shaded groups were to fall straight down without changing shape, they must completely fill the bottom half of the grid.

You can solve this puzzle here using puzz.link's interface