Tips & strategy
Empty a column as early as you can. An empty column is worth far more than a free cell, because it doubles the number of cards you can move as a group and can hold an entire sequence.
Do not fill your free cells. Every occupied cell shrinks the size of the run you can shift, and a board with four full cells and no empty column is usually lost even when it looks tidy.
Get the aces out but do not rush every card upward. Sending a low card to the foundation too early removes something you might have needed to build on, and unlike Klondike you cannot bring it back.
Plan several moves ahead before touching anything. FreeCell rewards looking at the whole board, because the move that helps is often four moves away and requires the free cells you were about to waste.