Block Droppin Blitz

This is a nice concept, combining Tetris and a traditional sliding block puzzle into one game. However, it does appear that the boards are generated at random and that provides the major issue I’m facing now. At some point, some of the tiles are locked and can only be unlocked by using them to make a puzzle piece of four squares. What happens when the one empty square you can slide a piece to is stuck in a corner between two locks? That’s precisely what happened when I reached the 167th level of this game. There’s no way to move any of the pieces into place to create a block to drop into the pit below. Making the game (for me at least) unplayable. I’m sure that was just an oversight by the game developers, but it does create a rather obvious problem. Hopefully they will fix that. But until then, I’m stuck with no moves to make and listening to the same music over and over again. Help? :)