Stacker is a skill with prize game, although the relative proportions are not specified by LAI or in the operator's manual, it does state a disclaimer that it is '100% a game of skill and although it is very difficult, every game played can be a winning game.' The owner's manual states that at the game's highest difficulty level, the estimated ratio of wins to losses will be near 1-in-800. However, the actual ratio may be lower or higher based somewhat on the skill of the players, with the approximate frequency of winning the major prize being set at the discretion of the game's operator.