Line Clear Graph:
Here's a neat hidden feature for Magical Tetris Challenge's Endless Tetris Mode.
Start a game in endless mode and tap A and B at the same time during gameplay.
This will switch on a graphical display on the 2P screen that shows how many
lines you have cleared (divided into singles, doubles, triples, and so on).
Shortening the Magic meter:
To short the magical gauge, you must clear all the blocks.
If you got it right, an ALL CLEAR! Sign will appear in your playfield