Red Star is a ball you can train your ninja with. It can be unlocked at level 13 for 400 coins/26 gems, and gives you 4,500 XP and 300 coins. (but if you master it, coins can't be earned from it).
In-game description: "Quick wits are required for this classic ninja ball!"
Moves
1-Star: Smash
2-Star: Hip Flick
3-Star: Hand Stand
Gallery
Trivia
The Red Star is called the Red Star most likely because it is red other than the yellow star located in the center of the ball.