[ljf]

Man there was some game similar to this called Sand Sand Sand, that I was totally addicted to. I showed my kid recently and he loved it too, timeless fun!

[thedrbrian]

There’s also the stand alone Powder Toy which has more powders and saves and such

https://powdertoy.co.uk/

[snazz]

And the modern web-based incarnation Sandspiel, which was extremely popular on HN a while ago: https://news.ycombinator.com/item?id=18696291