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| {{W|Source (game engine)|Source}} on {{W|Main Page|Wikipedia}}; | [http://source.valvesoftware.com/ Official Source Site] on [http://www.valvesoftware.com/ valvesoftware.com];

| engine = [[Source_Engine|Source Engine]] ...It will be released on Steam and makes use of a custom build of the Source Engine.

| source = http://store.steampowered.com/news/3825/ | source-title = Portal Update Released

| source = http://steamcommunity.com/games/450390/announcements/detail/6871793902544 | source-title = The Lab Update - July 1, 2016

...l]] in [[The Orange Box]]. It also runs under the same version of [[Source Engine]] that [[Portal]] runs under.

| engine = [[Source Engine]] ...ame, all of which requires the third portal. The mod is free on Steam, but it requires the user to have [[Portal 2]] in the library bought and installed.

| engine = [[Source Engine]] ...2'', which is free of charge but available via ''Steam for Schools'' only. It consists of the single-player story of ''Portal 2'' and [[Puzzle Creator]]

| engine = [[Source_Engine|Source Engine]] '''''Portal: The First Slice''''' is the demo version of ''[[Portal]]''. It is comprised of the first eleven test chambers of the full game.

| engine = Source ...is not compatiable to newer Steam version so if you throw it in sourcemods it will can't boot up.

| engine = [[Source Engine/pl|Source Engine]] ...os udający Cave'a Johnson'a, który próbuje przekonać ją, że jest rok 1952. It tells her to pick up a Portal Gun to participate in a "new test." After a f

| engine = [[Source Engine]] ...wakes up in a [[Relaxation_Vault|Relaxation Vault]]. The player must make it through several test chambers, occasionally going off track to discover mor

| engine = [[Source_Engine|Source Engine]] '''Rexaura''' is a [[Portal]] modification featuring new gameplay elements. It was initially released on ModDB on January 10, 2012. The mod has since been

| engine = [[Source Engine]] ...nstead of scrapping the alternative final chamber, Konclan was inspired by it to remake the entire campaign but as an entirely different experience, the

| engine = [[Source_Engine|Source Engine]] ...st chambers. After their completion, Chell reaches a white spherical room. It transports her back in time to Portal 2's ending, at which point GLaDOS tel

| engine = [[Source Engine]] ...o makes an appearance, though like in ''Portal'' the player must euthanize it at the end of the chamber.

| engine = [https://theportalwiki.com/wiki/Source_Engine Source Engine] ...Sixense was able to accomplish this through early access to [[Portal 2]]'s source code (before Portal 2's official release date). The most recent public buil

| engine = [[Unity Engine]]<br>[[Source Engine|Source Engine 2]] ...robot, defend a castle, adopt a mechanical dog, and more. Still not sold? It’s free!}}

| engine = [[Unity Engine/es|Unity Engine]]<br>[[Source Engine/es|Source Engine 2]] ...robot, defend a castle, adopt a mechanical dog, and more. Still not sold? It’s free!}}

| engine = [https://theportalwiki.com/wiki/Source_Engine Source Engine] ...Sixense was able to accomplish this through early access to [[Portal 2]]'s source code (before Portal 2's official release date). The most recent public buil

| engine = [[Source_Engine|Strata Source]] ...tagonist enters the device control room and Stirling instructs her to test it by first teleporting a [[Weighted Companion Cube]] through a short distance