Self-Contained Demo

Most video game demos simply use aspects of the game. Sometimes these demos use the first level of the game and sometimes they'll use random levels. In contrast, self-contained demos are not levels from the game itself. They use non-canon stories or side-stories to give you a feel of the game without spoilering anything or reusing a level.

Compare to Tech Demo Game.

Examples

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     First Person Shooters 
  • Half-Life:
    • Half-Life had a demo named Half-Life Uplinked, featuring a level that did not appear in the main game.
    • Half-Life 2: Lost Coast is a Tech Demo Game for HL2 that takes place on a coastal island well away from New Odessa.
  • Halo 2's demo at E3 2003 was an original level set in what became the New Mombasa levels. While the core mechanics demonstrated in it (dual wielding, vehicle hijacking, and enemy Brutes) were kept in the final game, the demo levels ran on an entirely different engine that was said to crash if the player went just the slightest Off the Rails.
  • The Jedi Knight II: Jedi Outcast demo was about investigating an enemy base that had no connection to the game itself.

     Horror 

     Misc 
  • In order to avoid spoiling the game itself, the creators of The Stanley Parable created a self-contained demo to promote it. The entirely original level contains the Narrator leading you through a tour of what is supposed to lead up to the Stanley Parable demo, but ends up becoming a surrealist nightmare. They even sent special editions of this demo to Let's Players Steam Train and Revision3 containing bits of dialogue directly addressed to them.
  • Glider PRO: "Demo House" served as the playable demo as well as the game's tutorial and Attract Mode. Though included with the full game, it is entirely separate from the game's primary scenario, "Slumberland."

     Role-Playing Games 
  • Pokémon:
    • Pokémon Omega Ruby and Alpha Sapphire had a downloadable demo where you played as the male lead (named "Landon" in the demo) set in Mossdeep City where you encounter Team Aqua and Team Magma.
    • Pokémon Sun and Moon had a downloadable demo where you played as the male lead (named "Sun" in the demo). It feature him arriving in Alola with his mom, but it's depicted in a completely different from the actual game. In the demo Sun receives a Greninja, which is a Kalos starter from Pokémon X and Y. This special Geninja can be transferred to the real games, and it as an ability called Battle Bond that Geninja normally does not have and can only be gotten from playing the demo. So playing the demo gives you a bonus in the real games.

     Real-Time Strategy 
  • The original StarCraft I demo was a campaign made of four levels that play before the events of the actual game. It was later made available as an extended version with additional missions that could be launched as a custom campaign from within the game.
  • Empire Earth has tutorials that are unconnected to the game's campaigns, like Phoenician settlers or Roman soldiers.
  • The demo of War Craft 3 was an extended version of the tutorial prologue of the actual game, featuring three extra levels. These levels were included as a bonus campaign in the Expansion pack.

http://tvtropes.org/pmwiki/pmwiki.php/Main/SelfContainedDemo