TwoCell or is that Two Cell is a version of FreeCell (or Free Cell) with two cells.
Personally I prefer Two Cell Solitaire to FreeCell. The use of two cells instead of four makes the game much much more challenging. FreeCell is better when you need (absolutely need) some success in your day.
My strategy, for what it's worth, is to clear one column on the Tableau as quickly as possible. Any card can be placed on an empty Tableau position, so it's like playing three cell;)