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21 Pinball

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Manufacturing date : February 24, 1960
Manufacturer : Williams Electronic Manufacturing Company
Number of players : 1
Theme : Cards/Gambling
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Pinball lesson with Wikipedia

Features of a pinball game

Playfield

The playfield is a planar surface inclined upward from three to seven degrees (current convention is six and a half degrees), away from the player, and includes multiple targets and scoring objectives. Hint: Some operators intentionally extend (to raise) threaded levelers on the rear legs and/or shorten or remove the levelers on the front legs to create additional incline in the playfield, making the ball move faster and harder to play. It is important that the playfield be level left-to-right; a quick visual test compares the top of the back cabinet against a brick or block wall behind it. Or, roll a marble down the center of the playfield glass. If it clearly rolls off to one side, a player may be inclined to stuff folded paper beneath the legs on the lower side to level the playfield. Additionally, leg levelers that are all extended fully make the game easier to nudge; when collapsed low, the entire game is more stable, and nudging becomes harder. A game that's fun to play makes more money for the owner; a game that is faulty does not get repeat customers. The ball is put into play by use of the plunger, a spring-loaded rod that strikes the ball as it rests in an entry lane, or as in some newer games, by a button that signals the game logic to fire a solenoid that strikes the ball. With both devices the result is the same: The ball is propelled upwards onto the playfield. Once a ball is in play, it tends to move downward towards the player, although the ball can move in any direction, sometimes unpredictably, as the result of contact with objects on the playfield or by the player's own actions. To return the ball to the upper part of the playfield, the player makes use of one or more flippers. Manipulation of the ball may also be accomplished by nudging (physically pushing the cabinet). However, excessive nudging is generally penalized by the loss of the current player's turn (known as tilting) or ending of the entire game when the nudging is particularly violent (known as slam tilting). Many games also have a slam tilt in the bottom of the lower cabinet to end the game if the cabinet is raised and dropped to the floor in an attempt to falsely trigger the coin counting switch.
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