Some day I'll write a fully procedural game, but until then I need tools to design the in-game spaces. There are a lot of really great existing tools out there, like LDtk, Tiled, Trenchbroom, and so on. I have used many of these to varying degrees and they're easy to set up and get running in your project - you just need to write a script to take the data they output and instantiate your game objects at runtime.
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Prostate cancer screening: What you need to know