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 cl eared (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.