N+ Codes -

Characters:
Complete the indicated task to unlock the corresponding character.

Blue Ninja: Collect 500 gold or successfully complete Episode 2 in Single Player mode. 
Gold Ninja: Successfully complete all 45 episodes in Single Player mode. 
Green Ninja: Collect 700 gold or successfully complete Episode 3 in Single Player mode. 
Pink Ninja: Collect 5,000 gold. 
Purple Ninja: Collect 1,000 gold. 
Red Ninja: Collect 300 gold or successfully complete Episode 1 in Single Player mode. 

Map packs:
Collect the indicated amount of gold to unlock the corresponding map pack

Blitz Map pack: 1,200 gold 
Co-op Map pack: 2,500 gold 
Domination Map pack: 3,000 gold 
Tag Map pack: 3,500 gold 

Music:
Collect the indicated amount of gold to unlock the corresponding music.

Bonus Music 1: 900 gold 
Bonus Music 2: 20,000 gold 

Animations:
Complete the indicated task to unlock the corresponding animation.

Victory Animation 1: Collect 400 gold or successfully complete Episode 1 in Single Player mode. 
Victory Animation 2: Collect 800 gold. 
Victory Animation 3: Collect 1,100 gold. 
Victory Animation 4: Collect 1,500 gold. 
Victory Animation 5: Collect 10,000 gold.