Tatsunoko vs. Capcom: Ultimate All-Stars/Unlockables

Tatsunoko vs. Capcom: Ultimate All-Shooters
After beating Arcade mode, press a button during the credits and a mini-game starts where you control Doronjo and her minions on a bike (or Roll on her broom, if you were playing as her), and you can collect letters from the credits. Collect all the yellow letters, which spell "THANK YOU FOR PLAYING", to unlock the Ultimate All-Shooters mini-game.