Adventure game
An adventure game is a video game in which the player assumes the role of a protagonist in an interactive story driven by exploration and puzzle-solving. The genre's focus on story allows it to draw heavily from other narrative-based media, literature and film, encompassing a wide variety of literary genres. Many adventure games (text and graphic) are designed for a single player, since this emphasis on story and character makes multi-player design difficult. "Colossal Cave Adventure" is identified as the first such adventure game, first released in 1976, while other notable adventure game series include "Zork", "King's Quest", "The Secret of Monkey Island", and "Myst".
Experience point
The concept of permanent power-ups that are progressively unlocked dates back to the early NES action RPGs, "Deadly Towers" (1986) and "Rygar" (1987), which blurred the line between the power-ups used in action-adventures and the experience points used in role-playing video games. The first video game to use the term "perks" to refer to such a mechanic was possibly the 1997 role-playing video game "Fallout". Perks have been used in various other video games in recent times, including first-person shooters such as "" (2007), "" (2009), and "Killing Floor" (2009), as well as action games such as "Metal Gear Online" (2008).