Many open-world games include a leveling system of some sort even if they are not straightforward RPGs. These games are usually longer than linear adventures, so players want some sort of ...

Log Horizon features an RPG leveling system for survival. No Game, No Life protagonists level up through high-stakes games.

They make all the hours in the game a lot more rewarding. Actually coding a good version of those leveling mechanics ... Ultimately, I wanted an RPG-Style leveling system that was easy to use, ...