at all was an impressive technical accomplishment, he concluded the port to be not worthwhile and gave it two out of five stars. GamePros The Axe Grinder instead stated that distant objects appear sharp and clear, and that it is objects which are close up which appear extremely pixelated. He gave the Super NES version a generally negative assessment, saying that the game is almost unplayable due to the unresponsive controls. On July 14, 2020, the source code for the game was released by Randy Linden, the game's creator, under the GPL-3.0-only license. PlayStation The PlayStation version of Doom was published and developed by Williams Entertainment and released on November 16, 1995. This version spent six months in development. It is one of the best selling versions of the game after the original PC version. It was re-released several times, first on the "Greatest Hits" range in the U.S., which requires that games have sold at least 150,000 copies there, and on the "Platinum Range" in PAL regions, which indicates that it sold over 600,000 copies in those territories. Changes from the PC original include the removal of the "Nightmare" difficulty level, and the fact that progress is saved via passwords (given at the end of each level). The passwords also save ammo and health stats, but the numbers for them are rounded. This version features 59 levels in total; 23 levels from the PC version of Doom (edited much like the Jaguar and 32X versions), both of the levels designed for the Jaguar version, six new levels designed by the Midway team, five levels from The Ultimate Dooms fourth episode, and 23 levels from Doom II. Unlike the other 1990s Doom ports, all of the enemies from the PC version of Doom are included. However, the Arch-vile monster from Doom II is not present; according to one of the game's designers, Harry Teasley, this was because he had twice as many frames as any other monster, and the team felt that they "just couldn't do him justice" on the PlayStation. There is, however, one new monster, the Nightmare Spectre. According to Teasley, this was included to add variety, and to take advantage of the PlayStation's capabilities. Two player deathmatch and co-operative multiplayer modes are available on the PlayStation if two consoles are linked using the original Serial I/O port, and each console has its own controller and Doom disc