the Sega CD as well as home computers, games with live action and full motion video featuring actors were considered cutting-edge, and some interactive movies were made. Some notable adventure games from this era are Under a Killing Moon, The Pandora Directive (both part of the Tex Murphy series), The Beast Within: A Gabriel Knight Mystery, Voyeur, Star Trek: Klingon, Star Trek: Borg, Ripper, Snatcher, Black Dahlia, The X-Files Game, Phantasmagoria, Bad Day on the Midway and The Dark Eye. Others in the action genre are Brain Dead 13 and Star Wars: Rebel Assault. Due to the limitation of memory and disk space, as well as the lengthy timeframes and high costs required for the production, not many variations and alternative scenes for possible player moves were filmed, so the games tended not to allow much freedom and variety of gameplay. Thus, interactive movie games were not usually very replayable after being completed once. DVD games A DVD game (sometimes called DVDi, "DVD interactive") is a standalone game that can be played on a set-top DVD player. The game takes advantage of technology built into the DVD format to create an interactive gaming environment compatible with most DVD players without requiring additional hardware. DVD TV games were first developed in the late 1990s. They were poorly received and understood as an entertainment medium. However, DVD-based game consoles like the PlayStation 2 popularized DVD-based gaming and also functioned as a DVD video player. In addition, the format has been used to import some video games to the DVD format, allowing them to be played with a standard DVD player rather than requiring a PC. Examples include Dragon's Lair and Who Shot Johnny Rock?. The PC/console game Tomb Raider: The Angel of Darkness was released in 2006 as a DVD game entitled Lara Croft Tomb Raider: The Action Adventure. Japanese games such as visual novels and eroge that were originally made for PC are commonly ported to DVDPG (a term that stands for DVD Players Game). Instead of standard save methods, DVDPGs use password save systems. Similar game types include BDPG (Blu-ray Disc Players Game) and UMDPG (Universal Media Disc Players Game). From the time of its original introduction, the DVD format specification has included the ability to use an ordinary DVD player to play interactive games, such as Dragon's Lair (which was reissued on DVD), the Scene It? and other series