Bonus Freecell Solitaire is a solitaire card game that is a modified form of Freecell. In Freecell Solitaire, the player uses reserve cells to temporarily store cards while attempting to sort the cards into the foundations. The primary differences between the standard version of Freecell and Bonus Freecell are 1. The player gets more reserve cells, and 2. The player now can only place Kings on empty columns.