CheatCodes.com has all the official Kid Icarus: Uprising 3DS cheats to unlock everything. If you know of any that we don't have, please let us know.
All published and official codes as of Tuesday May 21, 2013 for Kid Icarus: Uprising are shown below.
Go to the vault on the main menu and go to offering. If you give Palutena or Viridi enough hearts they will give you somthing.
In chapter 3, during the flight part of the level, when you have to fight 3-headed Hewdraw. Depending on the order of the heads you defeat, there will be different dialouge after you beat the true boss of the level ( the one at the lake ). One of them will say that he is proud of how strong you've gotten, while another will say he is to pretty to die.
When you die in a stage and the hearts spill out of the fiend's cauldron, hold down on the circle pad/circle pad pro (or the B button for alternative movement controls) you will see a short scene of the spilled hearts tumbling into the Underworld and an 8-bit Reaper from the original Kid Icarus getting startled.
After you beat the game, at the end of the credits, wait five minutes and then Hades will start talking and make a threat to delete your save data! He probably won't.
In Chapter 3:The Heads of Hewdraw, make sure that you get the grenade next to the second purple jump pad. Then, when you have jumped over the wall using the pads and use the grenade to blow up the container housing blue snakes in front of you, givingh you a key. THIS IS THE ONLY WAY TO GET THIS KEY AND UNLOCK THE COURTYARD WHERE YOU FIGHT HEWDRAW'S FIRST HEAD! If you don't do this, you will have to start the chapter over just to get the grenade, since you can't jump back over the wall.
Defeat the Final Boss and Boss Rush will appear next to Chapter 25
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