RPGs, specifically turn-based or strategy ones. Action is sometimes fine too. I like stuff with complex battle mechanics and tons of customisation/planning - anything that gets the brain working is fun, really.
I don’t like FPS in general. I’ve only completed Borderlands 2 and Fallout: New Vegas. I don’t like the perspective and the gameplay often feels dull to me. I don’t feel stimulated by them.
I still do sometimes, despite using DDG for about a decade now and working in IT myself. Haven’t met anyone who doesn’t say it in my area.