Bonus chapters:To unlock ten bonus chapters, complete all fifty single-player episodes.Gamerpic:To unlock an N Gamerpic featuring a black ninja with a red headband, complete the ten bonus chapters.Achievements:ACHIEVEMENT – HOW TO UNLOCKComplete 15 Episodes (10 points) – Complete 15 single-player episodes.Complete 30 Episodes (15 points) – Complete 30 single-player episodes.Complete 40 Episodes (20 points) – Complete 40 single-player episodes.Complete all 50 Episodes (25 points) – Complete all 50 single-player episodes.Complete 5 Co-op Episodes (15 points) – Complete 5 co-op episodes.Complete 10 Co-op Episodes (15 points) – Complete 10 co-op episodes.Speed Demon (20 points) – Win 10 races in ranked online matches.Survivalist (20 points) – Win 10 survival games in ranked online matches.Disciple (5 points) – Complete one tutorial episode.Perfectionist (20 points) – Complete an episode without dying in single-player mode.Treasure Hunter (20 points) – Complete an episode and obtain every gold piece in single-player mode. Practice Makes Perfect (15 points) – Die 1,000 times in single-player mode.