Magic Block (Unl) is an unlicensed NES game; that is, it wasn't officially produced or distributed by Nintendo or a licensed publisher. Unlicensed games frequently featured simple gameplay, borrowing elements from popular titles.  Magic Block most likely involved puzzle-solving or arcade-style mechanics centered around manipulating blocks.  The lack of official publishing details makes discovering the developer and release history difficult.

Magic Block (Unl)

Madou Senki - Deep Dungeon (Japan)