Adventure Time: Righteous Quest DS

Adventure Time: Righteous Quest DS is an Adventure Time game for the Nintendo DS and 3DS. The 3DS has an unlockable Fionna and Cake mode.

Plot
Finn and Jake are hanging out with Flame Princess, when the Lich swoops down from the sky and kidnaps her. The Lich brainwashes several of the villains in Ooo. Finn and Jake set out to rescue her, but along the way run into several of their old foes, such as candy zombies, super penguins, brain beasts, and more!

Normal Mode

 * 1) Earl of Lemongrab
 * 2) King Worm
 * 3) Donny
 * 4) Cute King
 * 5) Me-Mow
 * 6) The Farm
 * 7) Business Men
 * 8) Hunson Abadeer
 * 9) Sleepy Sam
 * 10) Baby Pigs
 * 11) Ricardio
 * 12) Marceline
 * 13) Ice King
 * 14) The Lich (first form)
 * 15) Sleepy Hunsonardio (a combination of Hunson Abadeer, Sleepy Sam, and Ricardio)
 * 16) The Lich (second form)

Fionna & Cake Mode (3DS Only)

 * 1) Earless of Lemongrab
 * 2) Queen Worm
 * 3) Donna
 * 4) Cute Queen
 * 5) Woof-Woof
 * 6) She-Farm
 * 7) Business Women
 * 8) Helen Abadeer
 * 9) Sleepy Samantha
 * 10) Gender-Swapped Baby Pigs
 * 11) Ricardia
 * 12) Marshall Lee
 * 13) Ice Queen
 * 14) Gender-Swapped Lich (first form)
 * 15) Sleepy Helenardia (a combination of Helen Abadeer, Sleepy Samantha, and Ricardia)
 * 16) Gender-Swapped Lich (second form)

How To Unlock Fionna & Cake mode
First, beat the game on normal mode. Then, go to the title screen and enter the Konami Code. Then, go to "extras", and select "secret mode". This only works on the 3DS.