in Adobe Photoshop. Much of the spoken dialogue was written by designer Mark O'Green, whose method of writing Taylor considered efficient and impressive. The companions, conceived late in development, were not easy to implement. As a result, they were riddled with glitches, including a tendency to shoot the Vault Dweller when they are obscuring an enemy. Dogmeat was the first companion added. Tycho was a reference to the desert rangers from Wasteland. Cain wrote the prologue, which included the series catchphrase "War. War never changes". Cain, who dislikes it when the player character knows more than the player, devised Fallout narrative so that the Vault Dweller would know just as much as the player. The quests in Fallout were given moral ambiguity, with no clear right or wrong solutions. This was done so the player could take whatever choice suited them best. An example is the final encounter with the Master, whose motives for establishing unity among the wasteland population and making it immune to radiation by turning them into mutants could be perceived as persuasive by the player. Vault Boy and his cheerful nature parodied how 1950s media downplayed the perils of nuclear war. Release Boyarsky and lead artist Jason D. Anderson created advertisements for Fallout. Fallout did not have a trailer, but a demo was released on April 26, 1997. The packaging was designed to resemble a lunch box, and the manual was designed to resemble a survival guide to reflect the game's style. Fallout was released on October 10, 1997, in North America for MS-DOS and Windows. The game was later released for Mac OS by the Interplay division MacPlay. Version 1.1 was released on November 13, 1997, patching many bugs in the original release and removing the 500-day time limit. The patch was released for the Mac OS on December 11, 1997. Fallout was initially not released in Europe due to the player's ability to kill children in-game. Version 1.2 removed the children from Fallout and it was released at an unspecified date in Europe. MacPlay, which had become independent from Interplay, ported Fallout to Mac OS X in 2002 as part of its "Value Series". Fallout and its sequels, Fallout 2 and Fallout Tactics: Brotherhood of Steel, were bundled as Fallout Trilogy in April 2009. To mark its 20th anniversary, the game was made temporarily free on video game digital distribution service Steam on September