Expert Challenge Stages
If you complete all 50 single-player chapters, 10 more are unlocked. They do not show up on the leaderboards and can not be played in multiplayer, their only purpose seems to be a personal challenge.
Contributed By: BobDole1216
New N+ Gamer Picture
Beat the expert level challenges to unlock a new N+ gamer picture to use with your Xbox Live Gamertag. The gamer picture features a black ninja with the red headband jumping through the air.
Unlockable
How to Unlock
Secret N+ Gamerpic
Beat Episodes 50-59
Contributed By: Cloud7654