About Action Games
While the individual objective of an action game changes and varies drastically from one game to another, it generally involves advancing through stages referred to as "levels"; along the way, eliminating hordes of enemies with minor puzzle solving involved. Many times the games include a "Boss" or "Bosses", often precluded by "Sub-Bosses" (more commonly known as Mini-Bosses). A mini-boss is usually the climax of a series of levels or each individual level, with a "Boss" being either at the end of the game or they can be tiered with many mini-bosses, a few bosses that are harder in difficulty and then finally leading up to an "End-game Boss" which would be the objective of the game.
Bosses are typically defeated by your "pattern recognition" skills and physical reaction speed. In most older action games and even in many modern ones, the bosses were programmed with a simple pattern of attacks or moves that would make them very difficult to defeat. But usually, after a few minutes or hours of trying anyone can defeat them as you simply learn the pattern from trying. These simple patterns would often include combo moves that require your character to jump, dodge or block an attack, then strike at certain points to deal damage to the boss, perhaps even waiting out or timing the patterns to get your attacks in.
Studies have shown that most people can improve their eyesight by playing action video games. Tests by scientists at the University of Rochester on college students showed that over a month, performance in eye examinations improved by about 20% in those playing Unreal Tournament compared to those playing Tetris. It is believed that this is due to the action game improving the spatial resolution of the players' vision.
Some Action Games
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Black Knight Game

You are a knight.. hmm -
2D Knockout

Take the challenge! Ju -
30k Starfighter

Fly through space as a