There are some user-submitted levels in The Powder Toy that cover a subset of your requirements: https://powdertoy.co.uk/Browse/View.html?ID=5170 https://powder

There are some user-submitted levels in The Powder Toy that cover a subset of your requirements: https://powdertoy.co.uk/Browse/View.html?ID=5170 https://powdertoy.co.uk/Browse/View.html?ID=5170