I have searched multiple engines for this game.
What I know:
It was a DOS game.
I'm fairly sure I played it before the 2000s.
I'm not sure what genre of game it falls in, but probably board or puzzle.
The graphics were 2D.
Other details:
You moved around Polyominoes (bigger Tetris pieces) as well as Pentominoes with no gravity.
You could move them up, down, left and right.
I played it with my brother so it at least had multiplayer (versus).
Some of the pieces had stuff inside them. Ex: a red or green square inside whichever segment of the piece.
Whenever you made a match with the stuff inside the pieces it would either help you clear your board or hinder your opponents board.
I wish I could remember more about it, but that is about all I have got.
If I remember anything else I will be sure to ether edit in or reply with it.
I appreciate any help I can get!