Earth Shaker partially reversed 2021.07-2022... sources can be compiled with SjASM+
https://worldofspectrum.org/archive/software/games/earth-shaker-your-sinclair
https://spectrumcomputing.co.uk/entry/1563/ZX-Spectrum/Earth_Shaker
https://www.the-tipshop.co.uk/cgi-bin/info.pl?name=Earth%20Shaker
Earth Shaker Editor
https://spectrumcomputing.co.uk/entry/14659/ZX-Spectrum/Earth_Shaker_Editor