Stacker is a game merchandiser manufactured by LAI Games, first produced in 2004. The goal of the game is to align rows of lights on top of each other. A player who stacks 11 rows can choose to take a minor prize. A minor prize is usually low in value, sometimes lower than the amount of money the player paid to play the game. A player who stacks the blocks to the top row wins the jackpot prize, called the "major prize." Major prizes vary from machine-to-machine but will often include high-value items such as game consoles, mobile phones, and gift cards. Gameplay For the first three levels, there is a row of three blocks which move side-to-side on the LED display. When the player presses the start/stop button, the row of blocks stop moving. Then, another row of blocks appear above the previous row, moving faster than the one before it. Blocks that do not align directly above the previous set are removed. If the player misses completely, the game is over. The number of blocks is automatically reduced to two at level four, then one at level 10. The goal is to consistently get the blocks directly above the previous set, stacking them to the minor prize and ultimately the major prize level. If the player accepts the minor prize, the game ends. Alternatively, the player can continue playing for a major prize. If a player reaches the major prize level on the 15th row, the lights will flash on and off, spelling the word "Win." Difficulty At the regular model's highest difficulty setting, the estimated ratio of wins-to-losses is 1-in-800. The margin for losing games can be set to almost double this in the Mega Stacker model which can hold bigger, higher value prizes, at an estimated wins-to-losses ratio of 1-in-1500. The game's operator's manual states a disclaimer that it is "100% a game of skill so although it is very difficult, every single game can be a winning game." While technically possible to win prior to the set win ratio being reached, the "window" for success is so small that it is infeasible to win. Even though it may appear to be correctly aligned, the block will shift a column if the button is not pressed within the extremely small opportunity window, deliberately causing the player to lose. After the desired ratio is attained, the window