Advanced Dungeons & Dragons: Dragons of Flame

Spatial thinking

Holding a map in your head. Play a maze game without the map screen for twenty minutes. Draw it on paper afterwards and check.

Problem solving

Stuck, then suddenly not. Ban walkthroughs for one game. Give yourself a day on any puzzle before you look.

Curiosity

What is behind that wall? Play one area without trying to finish it. Just poke at everything.