This idea is simple: you are a ninja that must climb the Infinite Tower.
There are only five commands: pressing a side of the screen will move your character there – the screen is divided in three equal parts, in vertical. And there’s also three attack buttons, each one with an advantage and a disadvantage in relation to another, like rock paper scissors.
The objective is to make the player think if it’s worth to risk a combat – enemies will always come, identified by colors that show their weaknesses -, or escape to another part of the screen. So the game is easy to learn, because the player can stay only in a single part of the screen and care only with the rock paper scissors, but if there are any power-ups the player can be motivated to risk himself and gain more points.