Sandbox game
From a video game development standpoint, a sandbox game is one that incorporates elements of sandbox design, a range of game systems that encourage free play. Sandbox design can either describe a game or a game mode, with an emphasis on free-form gameplay, relaxed rules, and minimal goals. Sandbox design can also describe a type of game development, where a designer slowly adds features to a minimal game experience, experimenting with each element one at a time. There are "a lot of varieties" of sandbox design, based on "a wide range of dynamic interactive elements". Thus, the term is used often, without a strict definition. Game designers sometimes define a sandbox as what it is not, where a game can "subtract the missions, the main campaign, the narrative or whatever formatively binds the game's progression, and you have a sandbox. "
In game design, a sandbox is a metaphor for playing in a literal sandbox. Game historian Steve Breslin describes "the metaphor [as] a child playing in a sandbox ... produc[ing] a world from sand", compared to games with more fully formed content. This metaphor between the virtual and literal sandbox is noted by architectural scholar Alexandra Lange, with a sandbox describing any bounded environment that offers freedom to explore and construct. This can distinguish it from conventional ideas of a game, where the metaphorical sandbox is a "play space in which people can try on different roles and imaginary quests ... rather than a 'game' to play. "
In describing video games, sandbox design is often associated with the open world gameplay mechanic and vice versa, but these are two disparate concepts. Open worlds are those where the player's movement in the virtual world is typically not limited by the game allowing the player to roam freely through it. "Adventure" on the Atari 2600 is considered an open world game as the player can explore the entire game world save for through locked gates from the start, but it is not considered to have sandbox design as the player's actions are generally restricted. Similarly, games like "Microsoft Flight Simulator" are also open world since the player can take their plane anywhere in the game's virtual world, but as there is no creative aspects to the game, would not be considered a sandbox. Sandbox design can incorporate several different game mechanics and structures, including open worlds, nonlinear storytelling, emergent behaviors, and automation of believable agents. It represents a shift away from linear gameplay. This freedom is always a question of degree, as a sandbox design "engenders a sense of player control, without actually handing over the reins entirely". Player creativity is often included in sandbox design. When a player is allowed to use a game as a sandbox, they gain the freedom to be creative with their gameplay. A sandbox will have a combination of game mechanics and player freedom that can lead to emergent gameplay, where a player discovers solutions to challenges that may not be intended by the developers. A sandbox sometimes gives the player "transformative" power over the game world, where "the free movement of play alters the more rigid structure in which it takes shape." Will Wright describes this generative aspect of sandbox designs, leading to a measurable increase in player possibilities. John Smedley describes this type of emergent gameplay more succinctly, having seen in EverQuest "how hungry people are for sandboxes -- for building stuff". "GameDeveloper.com" notes the growth of player-generated content as a "particular brand of sandbox design: that game design is so fun in itself that, if properly packaged, it can well be reinterpreted as gameplay itself". Some games offer a separate sandbox mode, where the player can use a game's creative systems with fewer constraints. "This mode has few restrictions on what he may do and offers no guidance on what he should do." For example, a sandbox mode might unlock unlimited resources, or disable enemy threats. A sandbox mode is separate from the campaign mode, without a main narrative progression. In one sense, an approach to this design is to "enable the player to continue after the main storyline has been 'won'. "
Many games tutorials utilize this type of design, since "sandboxes are game play much like the real game, but where things cannot go too wrong too quickly or, perhaps, even at all. Good games offer players, either as tutorials or as their first level or two, sandboxes." The game designers allows players to experiment in a safe environment, as "the point about open ended/sandbox design and when they work best in teaching the player is through learning by doing". Cohesive narratives in sandbox design can be difficult since the player can progress through the game in a non-linear manner. Some sandbox designs empower players to create their own stories, which is described as sandbox storytelling. Sandbox stories can either replace or enhance a main plot. Some games give players "pure agency by giving them tools and a sandbox", sacrificing the story in favor of player creativity. Where the game systems are reactive enough, this "does not remove the narrative, but rather transforms predetermined narrative into dynamic, responsive narrative". According to Ernest Adams, "in sandbox storytelling, the idea is to give the player a big open world populated with opportunities for interesting interactions ... in any order". Sandbox stories can also be told through shorter quests, conversations, collectibles, and encounters, all of which reward players for engaging with the world. This side-content becomes an "extremely common and an excellent format for sandbox gameplay: one central campaign (itself perhaps multi-threaded), plus a large number of side-missions". In general, sandbox storytelling occurs when the player can move through the story independently of their movement through the game space. Designers also refer to sandbox worlds and sandbox game spaces, which create the feeling of a large open world. The concept of an open world is much older than the term sandbox. Overall, "a sandbox design usually means that the game space is not divided into discrete units", which emphasizes continuity and exploration. This can sometimes overwhelm the player, which is why successful game designers draw on "urban design principles that can be used to build successful sandbox spaces". As a best practice "when creating these sandbox worlds, [designers] should divide them up into distinct areas to aid the player's navigation and orientation." Overall, a sandbox world should "provide the player with a large open set of spaces in which to play, and give him or her things to do". "The more a game's design tends towards a sandbox style, the less a player will feel obliged to follow the main quest. "
Game designers often need to create more dynamic game systems to support sandbox-style gameplay. Physics systems are part of the sandbox experience of several games. The popularity of voxels has also shown another system that can create "colorful sandboxes to dismantle and reconstruct. "
There is also the value of more robust artificial intelligence. "GameDeveloper.com" notes how "a sandbox means that the whole game becomes more of a simulation where AI plays an important role." This means that "believable and self-motivated characters have become key to sandbox play, because they produce a rich space for interactivity and greatly help establish the open-world aesthetic." Game designer John Krajewski observes for "a game that features sandbox-style play, the AI needs to provide enough different and interesting characters to interact with in the world, and the size of the world doesn't have to get very big before it becomes unfeasible to hard code them all."
An open-ended sandbox experience is sometimes contrasted with goal-oriented gameplay. Sandbox design usually minimizes the importance of goals. Rather than 'winning' a game, a sandbox design allows player to 'complete' a game by exploring and actualizing all of its options. This lack of victory condition may define sandbox as not a game at all. "For many, a game needs rules and a goal to be a game, which excludes sandbox/simulators." In sandbox mode, "the game resembles a tool more than a conventional video game". Sandbox design has been criticized for providing a lack of satisfying goals for players. According to Ernest Adams, "plunking the player down in a sandbox and saying, 'have fun' isn't good enough. Especially at the beginning of a game, the player should have a clear sense of what to do next and, in particular, why." Christopher Totten observes that "sandbox elements can be mistakenly taken as fair replacements of narrative content; indeed, many games have missed their potential because they imagined that free-play would compensate for a lack of narrative. But even for our idealized child, playing around in a physical sandbox gets old pretty quick." Critics point to repetitive in-game tasks, arguing that an "overabundance of mundane events can get in the way of enjoying the sandbox." "GameDeveloper.com" notes that the quality of sandbox gameplay varies because "the great risk of the sandbox is that it can be boring." This is because "sand by itself is not much fun. Automated, complex, and perhaps most of all, "directed" responsiveness is essential to sandbox play, and the more complex and responsive the world, the more interesting the sandbox. " Multi-user dungeons (MUDs) are early examples of the principles of sandbox games; users of MUDs would generally be able to gain the ability to create their own content within the MUD's framework, creating opportunities to collaborate with other users. However, MUDs never gained commercial release; while they inspired the first massively multiplayer online (MMO) games like "Ultima Online", the creation aspects of MUDs did not carry into commercial games. Prior to 2000, the bulk of what were considered sandbox games in commercial software came from two genres:

Two games at the turn of the 21st century redefine the notion of what a sandbox game is. These two games would become a major influence on many different games and genres to come. In 2007, game designer Warren Spector noted the influence of Will Wright on numerous designers, but was surprised that there weren't more who "mimic Wright's games or his sandbox-style, saying titles in the "Grand Theft Auto" look-alike genre are about the closest most developers have come to doing so." This influence led to a trend, and by 2010 critics were noting that "almost every blockbuster game now contains a considerable 'sandbox' element." This trend was linked to the rise of dynamic storytelling in sandbox worlds, as well as AI that is dynamic enough to supplement scripted content. Another major shift in sandbox games came with the release of "Minecraft", which was first introduced in 2009 in beta form and its first full release in 2011. At its core, "Minecraft" is a voxel-based survival game, where players collect resources to built tools that help them to collect better resources, and to construct shelters to protect them from hostile creatures. However, there are no limits on how players can build these structures, and using the vast array of resources available in the game, players can build nearly anything they could imagine; the game has been compared to digital Lego bricks. Players' use of "Minecraft" in this way led to the developers to add a dedicated "Creative Mode" that stripped the survival elements from the game so that players could build without any hazards or other artificial limits. "Minecraft" became a massive success, having sold more than 180 million copies by May 2019 and being the best selling personal computer game of all time. With time, sandbox design had become a mainstay in survival games, as well as a popular subset of shooters, and RPGs. Long-time series such as "Metal Gear" had made the "shift to an open-world sandbox design," where the game dynamically "adds more missions as the story progresses and players complete the available side-ops". Other long-running series such as "Hitman" were celebrated for their sandbox design. The series became influential, creating a new template of games "that echo the same emphasis on sandbox design, open-ended mission structure, and sneaking". In 2020, PC Gamer noted "Mount & Blade" as "a triumph of sandbox design". They observe that "because of its sandbox nature, "Mount & Blade"s quests are procedurally generated around a number of set templates," which leads to a game where "the simulation is the story". One pure sandbox game, aimed to offer no goals but allow players to create works to be shared with others, is "Second Life" (2003), a large massively multiplayer online game set in a virtual world where users could create various sections of the world as their own. The game was purposely developed as a community-driven world, so while the developers established some of the fundamentals of the in-game economies, much of how the workings and economics of the rest of "Second Life"s world was set by the players, which created several issues around pricing, gambling, and taxes, among other aspects. The game ultimately drew use by business as well, seeking to create space within it. More recent sandbox games have been aimed at provided interactive works that can be shared with others. "Garry's Mod" allows players to tinker with the Source engine from Valve to make animations and games while games like "LittleBigPlanet" and "Dreams" (2019) from Media Molecule give uses assets and primitive programming elements to craft games that can be shared with others. Some sandbox games have gained favorable use in education settings for inspiring studies to use creativity and critical thinking skills. Part of Microsoft's rationale for acquiring Mojang, the developers of "Minecraft", for in 2014 was for its potential application in Science, technology, engineering, and mathematics (STEM) education, according to CEO Satya Nadella on its acquisition in 2014, as the game already helps to pique children's curiosity. Microsoft subsequently enhanced the "MinecraftEDU" version of the game into its "Minecraft: Education Edition" that gives teachers and students numerous pre-made resources to work from, and the ability for teachers to monitor and assist students in their work, but otherwise allowing students to create and learn following several lesson plans developed by Microsoft.
Terminology
Sandbox games are often associated with an open world concept which gives the player freedom of movement and progression in the game's world.