A separate genre of computer games is a puzzle game. This type of games assume different puzzle solving. The most typical objects that the gamer should resolve are strategy (Mystery Case Files series games), logic ("Mystery Case Files Huntsville" game), pattern recognition ("Mystery Case Files Prime Suspects" game), sequence solving, word completion or, in some cases, just pure luck ("Mystery Case Files" series games).
Even before there were video games, there were jigsaw puzzles and the Rubik's Cube game, today's puzzle game prototypes. The puzzle games genre can be difficult to portray: the gameplay is usually (but not always) abstract often involving organizing geometric shapes to fulfill some goal. Often edge matching or colour matching plays an important role. Zuma is a classic of such sort of games. Puzzle games usually strive to have a pick-up-and-play accessibility to them and to have an addictive quality.
Some puzzle games feed the player a random assortment of blocks or pieces that they must organize in the correct manner (Tetris, Klax, Lumines), where others present a preset game board and/or pieces and challenge the player to solve the puzzle by achieving a goal (Bomberman, The Incredible Machine). Some of the games in the former category have a mode that plays like the latter. For example, in both Tetrisphere and Tetris Attack, there is an actual "puzzle mode" in which the player must clear a pre-defined board within a certain amount of moves.
Some games are not actually puzzle games, yet contain many puzzle elements, such as Resident Evil, Silent Hill and the Legend of Zelda series.
Because puzzle games are often so abstract, the term is sometimes used (be it correctly or not) as a blanket term for games with unique and otherwise indescribable gameplay. Every Extend Extra is a fine example of this.
Puzzle games are relatively easy to develop and to take from dedicated arcade units, to home video game consoles and even to personal digital assistants and mobile phones.
While the individual objective of an action game varies drastically from game to game, 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 destructed by your "pattern recognition" skills and physical reaction speed. In most older action games and even many modern ones, the bosses were programmed with a simple pattern of attacks or moves that would make them very difficult to defeat. Though usually after a few minutes or hours of trying anyone can defeat them as you simply learn the pattern from trial and error. These simple enough 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.
Many sub-genres such as platform games and action-adventure games add gymnastic-style puzzles, such as timing jumps to and from moving platforms (hence the name Platform games). Virtual Villagers is an example of this type of games. Platform games, whether 3D or 2D are usually similar in concept to the original Mario Bros. series of games originally in the arcade then on the Nintendo video game console. Some action games feature 3rd-person-shooter-game-play elements, thus enabling the player to pick up and upgrade various weapons, each sporting its own special abilities.
Another common sub-genre is the Shoot'em up; which usually involves the player controlling a character or vehicle brandishing many weapons and shooting literally almost everything moving on the screen. The Shoot'em up genre is well known for its side and vertical scrolling shooter games.