To use:
Press F2 to go to the test menu, then turn on the cheat. The screen will change to the character test screen. If you're unable to access the cheat option, check
"You may not have access to the cheat option when you press Tab. Maybe this can help." in
this thread.The buttons:
P1 Coin: Affects the text and BG. Had I known about this, I wouldn't have searched for a cheat to hide the text. :p
2P Start: Changes the background color two ways: Holding it causes gradual changes in color, tapping it causes sudden changes.
Hold P1 Button 2 and press either Up or Down: Changes what sprite set you want to look at. Use this to find Lynn's sprites. To get to Lynn, press up 12 to 16 times.
1P Up or Down: Changes what sprite set you want to look at. Use this to go through all of Lynn's animations.
1P Left or Right: Changes what direction the sprite's facing.
3P Up or Down: Flips the sprite up or down.
3P Button 3: Changes the palette the sprite's using. This is useful for portraits, and BG things.
Hold P1 Button 1: Quickly goes through the frames to an animation.
P1 Button 2: Resets animation to first frame.
P1 Button 3: Cycle frame by frame through an animation.
There may be more things that it can do, but that's what I found playing around with it. Also, it's possible there's some functions to this that're unusable. I say this because of the multiple Nage Tests I found that had varying degrees of functionality.