Janken Horn is a "Rock Paper Scissors" card game. When a simple luck testing game suddenly becomes a strategy game, you will understand. Why does it make you think so much when all you need to do is to pick one from Rock/Paper/Scissors?

Janken Horn is a "Rock Paper Scissors" card game. When a simple luck testing game suddenly becomes a strategy game, you will understand. Why does it make you think so much when all you need to do is to pick one from Rock/Paper/Scissors?