Game Design
Level Design
Game Theory
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Level design, they say, is where the rubber meets the road in Game Design. You can put average systems together in a fun way to still end up with a great game. I suggest building from the middle out. Experiment with mechanics to their breaking point looking for hooks that each level can focus on. Play, play, play. Always start and iterate your designs as a player. This is how I do what I do.

As a child I drew mazes. It seems I still do.