About:
Portal: The Flash Version is a two dimensional game made with Adobe Flash based on Valve's Portal. It features the same environment and testing elements as Portal does, while even introducing some new features of its own. This game has also been recreated into the Portal Software Development Kit (Source SDK) and released as a Map-Pack. Some of the levels are included in the XBOX Live Arcade version of Portal, Portal: Still Alive. Some of the levels and mechanics used in this mod have also been "borrowed" over into a few other Map-Packs, or "Mods". This can most commonly be found in the Portal: Prelude mod, which uses the Electricity Field and a few of the levels used in the flash version.The game starts with the words "Good morning subject 15837. It is time to begin your test." after which the first "task" (which is what the game familiarizes the test chambers as) starts with the use of the ASHPD or Portal Gun. The text on top of the screen suggests that the subject might not be familiar with the facility, but explains that they need to exit the rooms. The first task where the player can be killed in is Task: 10, where a ledge the player needs to Portal over is introduced. The first encounter with a dangerous mechanic happens in Task: 11, with a modified "Crusher" used in the trailer for Portal. Most of these tasks do not require precise timing, except for a few tasks featuring the High Energy Pellet (known as Combine Balls in the Half-Life Universe) or the dangerous "Electricity Field", that lights up for four seconds at a time and then pauses for three seconds.
https://theportalwiki.com/wiki/Portal:_The_Flash_Version
https://theportalwiki.com/wiki/Portal:_The_Flash_Version