The basic game mechanic is the same: Shoot two portals to move around an area that could not be accessed otherwise. The game is two dimensional, but, like the original 3D game, features an Affably Evil AI named GLaDOS who uses increasingly cruel traps in order to kill the player character. The game has lethal yet necessary energy balls, spike traps, Bottomless Pits, turrets and more.
The game has garnered some internet popularity, and can be played here. A mappack for the original Portal was later released, including ALL 40 levels from the original Flash game, additional bonus levels and features.
Oddly, the game was made sometime before Portal was released, so some in game details are incorrect.
This game provides examples of:
- A.I. Is a Crapshoot: GLaDOS.
- Big Bad: GLaDOS. Big time. See above.
- Bottomless Pits: Featured in the flash game as opposed to acid pits. The mappack version switches back to acid pits.
- The Cake Is a Lie: Have you forgotten what series this is based off of? Subverted, as you actually do get cake at the end of the game.
- In the mappack version, you don't.
- The Cameo:
- No longer canon since Portal 2, but around the middle of the game, you get to see the Borealis in its drydock, along with a screen showing its blueprints. And to progress, you have to push a button that loads Personality Cores onto one of its crates.
- In the web version, The G-Man appears behind a window in chamber 16.
- Companion Cube: Based on the trope namer.
- Damn You, Muscle Memory!: In Valve's Portal, left and right click fires blue and orange portals respectively, E picks up/interacts with objects, and space jumps. In the flash version, Q and E fire one color each of the portals, the left mouse button fires alternating portals, right click opens the useless Flash menu (which to be fair, they couldn't deactivate no matter what they tried), F picks up objects, and W jumps.
- Deadpan Snarker: GLaDOS in the mappack version, as it reuses voice clips from the original game.
- Developer's Foresight: In the mappack, if you drop yourself into the incinerator instead of the Companion Cube, a line of text reading "Oh the irony!" appears before you die.
- Descending Ceiling: Brought back from Portal's original trailer, though the mappack doesn't include spikes.
- The Elevator from Ipanema: One level in the mappack has an Unstationary Scaffold that plays a slowed-down version of the Still Alive radio tune as it moves. And you have to block turrets with your Companion Cube throughout the ride.
- Fake Difficulty: The character has a tendency to keep running, even though your finger isn't on the button anymore. It doesn't help that this usually happens at the worst possible times, too.
- Final Boss: In the mappack: Aperture Science Heavy Duty Super Attack Mecha.
- Freeware Games: Was released for free.
- Greater-Scope Villain: In the mappack version. Congratulations. You escaped GLaDOS and are now free. Have fun with the Combine.
- Heroic Mime: The player character doesn't speak.
- Nintendo Hard: Some of the latter levels fall into this trope.
- Non Standard Game Over: In the Mappack, if you trap yourself in one of the chambers, GLaDOS automatically kills you.
- One-Hit-Point Wonder: The player character suffers from this. Can come up in the mappack's ending as sometimes the Combine Gunship will fire upon you, killing you as the credits roll.
- The Reveal: There's a pretty big one in the mappack version. Chell is one of many clones made for testing.
- Prequel: The mappack is advertised as taking place before the original game.
- Spikes of Doom: On the crushers.
- 20 Minutes into the Future
- Unintentionally Unwinnable: One puzzle in the mappack has a cube fall onto a button in a room that can only be reached if that button is pressed - so if the cube bounces off, that part of the puzzle is unreachable, making it unsolvable.
- Web Game: Was released online.