Vegas Connection: Casino Kara Ai wo Komete

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.

Reading people

Spotting the habit before the move. Spend a whole round just watching your opponent. Do not try to win it. Name their habit.

Problem solving

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