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Prison Architect
The game I have been playing most lately is Prison Architect
http://www.introversion.co.uk/prisonarchitect/
It's only a 2D game, but the simulation is quite gritty - none of the lala rainbows of later sims games. They take drugs, riot, and you even need a mortuary in the game (no grim reaper to tidy up - the bodies need carrying by guards). The aim is to build up reputation and funding by decreasing escapes etc and by rehabilitating prisoners so they don't reoffend.
The game is still in active development and there is a new alpha each month. But you do have to pay $30 for it - then all updates are free.
"You can do refraction by raymarching through the depth buffer" (c. Reddeyfish 2017)