Cat play and toys incorporates predatory games of "play aggression". Cats' behaviors when playing are those similar to hunting behavior. These activities allow kittens and younger cats to grow and acquire cognitive and motor skills, and to socialize with other cats. Cat play behavior can be either solitary (with toys or other objects) or social (with animals and people). They can play with a multitude of toys ranging from strings, to small furry toys resembling what would be prey (e.g. mice) to plastic bags.
Since cats are meat-eating predators, nearly all cat games are predatory games.
Prey is fearful of predators. Predators often encounter prey that attempt to escape predation. Prey that moves towards the cat with confidence may be exhibiting an aggressive defensive posture. Cats often play with toys that behave more like fearful prey trying to escape than toys that mimic a more confrontational prey.
Success rate is important in play. A cat that catches its prey every time soon gets bored, and a cat that never gets it just loses interest. The ideal hunting success rate is around 1 in 3 to 1 in 6. Capturing prey at this rate generally maximises a cat's interest in the game.