Crimson Room

Crimson Room is a 2004 online point-and-click adventure game created by Japanese developer Toshimitsu Takagi. Developed with Adobe Flash and released for free on the internet, it broke out in popularity and is often credited with popularising the escape room video game genre (also known as the 'escape the room' genre), even inspiring the term 'Takagism' used in Asia to refer to the genre.

The game begins with text explaining to the player that they have mysteriously awoken in a room and must escape. They may then explore the room, which is portrayed graphically with a series of fixed camera angles in a three-dimensional space, and can click certain spots in the room to investigate objects or uncover new angles, gathering items they find and using them to attempt to escape the room and complete the game.

Takagi developed three follow-up games following the same format: Viridian Room and Blue Chamber, released later in 2004, and White Chamber, released in December 2005. All four games were made available to play online for free, and later included in two collections for handheld consoles: Crimson Room for the Nintendo DS and the expanded remake Crimson Room Reverse for the PlayStation Portable. A port of the original Crimson Room for feature phones became available in 2006, and an adaptation of the game for Android and iPhone devices titled Crimson Room '11 was released in 2011. A full sequel, Crimson Room Decade, was released in 2016 for Windows and Mac OS X.