Game is a structured exertion, commonly undertaken for delectation and periodically used as an educational tool. Games are different from work, which is commonly carried out for compensation and from art, which is more involved with the description of concept. However, the achievement is not clear-cut and many games are also deliberate to be work or art such as jigsaw puzzles or games involving an artistic layout such as Mah-jongg solitaire. Main factors of games are goals, rules, challenge and interaction. Games commonly include mental or physical motivation and often both. Many games help generate proficient skills, function as a form of exercise or otherwise play an educational, inspiration or psychological role. According to Chris Crawford, the necessity for player interaction puts exertions such as jigsaw puzzles and solitaire games into the class of puzzles significantly than games.

Video games are computer or microprocessor controlled games. Computers can establish implicit tools to be used in a game between human or simulated human contenders, such as cards or dice, or can imitate far more involved worlds where mundane or fantastic things can be manipulated through gameplay.

A tabletop game commonly assigned to any game where the elements of play are limited to a small area and which need little physical activity, usually simply placing, picking up and moving game pieces. Most of these games are thus, played at a table around which the players are seated and on which the game's factors are situated.

Types of tabletop games:

1) Dexterity/coordination games.
2) Board games.
3) Card games.
4) Dice games.
5) Domino and tile games.
6) Pencil and paper games.
7) Guessing games.

Gear, toothed wheel, cylinder or cone that transmits motion from one part of a machine to another, that is one of the oldest resources of transmitting motion. When the teeth of two gears are entangled, turning one gear will cause the other to circle. In most cases both gears are climbed on shafts so that when one shaft turns, the other also rotates. By entangling two gears of various diameters, a variation in both speed and torque between the two shafts is obtained, the smaller gear in this case is called the pinion. A spur gear consists of a wheel with straight teeth mounted radially either on the center circuit internal spur gear or outer circuit external spur gear of the wheel.