Mega Drops 2 by daaa57150 is a musical puzzle game, it’s the successor of Mega Drops.

Release notes:

A pair of blocks fall in a grid, and you have to place it so that 4 or more blocks of the same shape collide and explode. Lines appear from the ground and the goal is to resist until the end of the music.

http://forums.qj.net/showthread.php?t=144298