The videogame compass

Mainstream
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Casual---------|-------------Hardcore
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Obscure

>>13
t. someone who never played Nethack

if you want roguelikes that are actually similar to Diablo, how about the ones that inspired it: Moria, Angband, Castle of the Winds? Nethack is nothing like Diablo other than that it has randomly generated levels. its core challenge isn't even combat, it's item-related puzzles: identification (which might be the most important part of Nethack, while fairly trivial in Moria-likes), interactions, inventory management.