ESRB ratings are used in the USA.
|EC||Early Childhood||No Kirby/Zelda Games|
All Kirby games except for Kirby's Return to Dream Land
Most Zelda games
|E10+||Everyone 10+||Kirby's Return to Dream Land, Spirit Tracks, and Skyward Sword|
|T||Teen (13+)||Twilight Princess, Link's Crossbow Training|
|M||Mature (17+)||No Kirby/Zelda Games|
|AO||Adults Only||No Kirby/Zelda Games|