the author of this app says:
Shiftris is a puzzle game similar to Squaretris, but the game play and strategy are completely different.
In this game, you drag the rows and columns of the grid in order to make lines with the balls located on it.
Each time you make a move, a differing number of balls (depending on the difficulty level) is placed in random locations.
Shiftris has many features, including:
The Puzzle Mode has a built-in level editor for users to make their own levels, as well as challenge other players to complete them.
Unregistered users can play 30 levels of the puzzle mode. Registered users can load any database, including one with 100 levels (located on the zip file).