การดู
9 Brain Exercises to Strengthen Your Mind
6 Logical reasoning questions to trick your brain
Using Brain Teasers to Build Critical Thinking Skills
10 Math Games That'll Boost Your Brain Power By 80%
18 Tricky Riddles That'll Stretch Your Brain
9 Psychological Tactics to Read People’s Minds
The Game of Life and How to Play it (1925) by Florence Scovel Shinn
What Makes Games FUN (Psychology in Gaming)