such systems were in the late 1970s and early 1980s and had a crude plain-text interface. Later systems made use of terminal-control codes (the so-called ANSI art, which included the use of IBM-PC-specific characters not part of an American National Standards Institute (ANSI) standard) to get a pseudo-graphical interface. Some BBSs offered access to various games which were playable through such an interface, ranging from text adventures to gambling games like blackjack (generally played for "points" rather than real money). On some multiuser BBSs (where more than one person could be online at once), there were games allowing users to interact with one another. SuperSet Software created Snipes, a text-mode networked computer game in 1983 to test a new IBM Personal Computer–based computer network and demonstrate its abilities. Snipes is officially credited as being the original inspiration for NetWare. It is believed to be the first network game ever written for a commercial personal computer and is recognized alongside 1974 game Maze War (a networked multiplayer maze game for several research machines) and Spasim (a 3D multiplayer space simulation for time shared mainframes) as the precursor to multiplayer games such as 1987's MIDI Maze, and Doom in 1993. In 1995 iDoom (later Kali.net) was created for games that only allowed local network play to connect over the internet. Other services such as Kahn, TEN, Mplayer, and Heat.net soon followed after. These services ultimately became obsolete when game producers began including their own online software such as Battle.net, WON and later Steam. The first user interfaces were plain-text—similar to BBSs— but they operated on large mainframe computers, permitting larger numbers of users to be online at once. By the end of the decade, inline services had fully graphical environments using software specific to each personal computer platform. Popular text-based services included CompuServe, The Source, and GEnie, while platform-specific graphical services included PlayNET and Quantum Link for the Commodore 64, AppleLink for the Apple II and Macintosh, and PC Link for the IBM PC—all of which were run by the company which eventually became America Online—and a competing service, Prodigy. Interactive games were a feature of these services, though until 1987 they used text-based displays, not graphics. Meanwhile, schools and other institutions gained access to ARPANET, the precursor of the modern internet, in the mid-1980s. While the ARPANET connections were intended for research purposes, students explored ways to use this connectivity for