When you Complete the Game on any difficulty
You gonna have a multiple things as gift
3 characters and 2 weapons and 1 air-dodge
When you get the characters
Go to main menu and press on play
and go up

and press

then select
the third character and Complete
the game with it on any difficulty.
Note: if you Complete any level with this
character go to select level and you can see a little red thing on the right hand if it's there that mean you Complete the level with the character The Character Color is purple