Major prizes vary from machine-to-machine but will often include high-value items such as game consoles, mobile phones, and gift cards.
[1] 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.
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 is left open for as long as the block is displayed on screen, making it significantly easier for a skilled enough player to win the game.
Such techniques use high-value products that are either difficult to obtain due to cost, especially for young people, or are simply visually appealing.
In Europe, the primary distributor of Stacker is the Austrian company funworld AG, distributing in 14 European countries: Germany, Switzerland, France, Greece, Netherlands, Montenegro, Poland, Romania, Slovenia, Sweden, Spain, Czech Republic, Hungary, United Kingdom and Cyprus.