A quick guide to unlock the secret characters in the game through both methods, there’s relatively few in this game, but they’re quite unique for a Puzzle game.
 
 

Notes

Since you only use two buttons to play, there are only two colours available per character, and those are the only buttons you will use to select characters. Also the characters in this guide are organized by the order they can be selected through Easy Select for convinience.
 
 
 

Devilot de DeathSatan IX

 
To unlock Devilot through Original Select: Press and hold the Start button. Press Down 13 times and wait for the timer to reach 10 seconds. Press a button right as it reaches 10.
 
 
To unlock Devilot through Easy Select: Press Down from Morrigan
 
 
 

Akuma/Gouki

 
To unlock Akuma/Gouki through Original Select: Highlight Ryu and hold the start button. While holding it, press in the following order: Down, Left, Down, Left, Down , Left, Down, Left (continue holding it after pressing it). While still holding Start and Left, press any button.
 
 
To unlock Akuma/Gouki through Easy Select: Press Down from Hsien-Ko/Lei Lei
 
 
 

Dan Hibiki

 
To unlock Dan through Original Select: If you’re Player 1, highlight Morrigan; if you’re Player 2, Highlight Felicia. Then, press and hold the Start button, press Down 13 times and then press one of the two buttons to either use his default or his alternate colour.
 
 
To unlock Dan through Easy Select: Scroll down from Donovan
 
 

 
 
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