https://en.wikipedia.org/wiki/Brataccas

Brataccas displays the game world in flip-screen format, with the map divided into rooms that are drawn into the display as the character moved through the habitat. The screens flipped when Kyne passed from room to room, typically through doors. Most movement was horizontal, with automatic elevators providing vertical movement between floors where required. Occasionally, labeled doors in the rear wall or teleportation booths with the appearance of cylindrical shower stalls led the player to different sets of rooms. The term "rooms" is slightly inaccurate, as there were also a small number of outdoor areas displayed using the same system. In order to preserve detail on the character animations, the characters had to be fairly large, making the rooms small in relative terms. They could get quite crowded with even a few characters in them.

The player had a limited amount of interaction with the game world, generally limited to movement, picking up or dropping objects, or talking to non-player characters (NPCs). These NPCs operated under computer control and pursued their own objectives, sometimes even engaging in combat with other NPCs. All the game's characters utilized swords in combat to maintain extended battle in the small rooms, justified in-game as a measure to avoid potential loss of atmosphere to space from stray ranged weapons fire.

Interaction between characters was carried out through dialog bubbles similar to those in comic strips. The player could only respond to other statements, at which point a menu of possible responses appeared. The selections were fairly limited, and the outcomes often seemingly random. Additionally, a number of loudspeakers located in some rooms would announce events like fights breaking out. No attempt was made to "declutter" the balloons, so if more than two characters were talking the screen would often fill with them, rendering most of them unreadable.

The control system was an early example of a gesture-based interface, or as many reviews pointed out, a poor attempt at one. To move, the mouse was moved in the direction the player wanted to walk, or faster if they wanted to run. However, the inaccuracy of the system combined with lag times in the interpretation of the movements often rendered the game almost uncontrollable. One reviewer wrote, "Controlling Kyne reliably ... in a critical situation is nearly impossible."[3]

Interaction with objects was limited to picking them up or dropping them, at which point other characters might interact with them as well. For instance, one could buy information by dropping money, bags of which were scattered around the game world. One annoying gameplay problem was that if Kyne fell from one level to another, he would drop whatever he was holding. If another character was there, they would pick it up.

https://en.wikipedia.org/wiki/MUD

A MUD (/mʌd/; originally Multi-User Dungeon, with later variants Multi-User Dimension and Multi-User Domain)[1][2] is a multiplayer real-time virtual world, usually text-based. MUDs combine elements of role-playing games, hack and slash, player versus player, interactive fiction, and online chat. Players can read or view descriptions of rooms, objects, other players, non-player characters, and actions performed in the virtual world. Players typically interact with each other and the world by typing commands that resemble a natural language.

Traditional MUDs implement a role-playing video game set in a fantasy world populated by fictional races and monsters, with players choosing classes in order to gain specific skills or powers. The objective of this sort of game is to slay monsters, explore a fantasy world, complete quests, go on adventures, create a story by roleplaying, and advance the created character. Many MUDs were fashioned around the dice-rolling rules of the Dungeons & Dragons series of games.

Such fantasy settings for MUDs are common, while many others have science fiction settings or are based on popular books, movies, animations, periods of history, worlds populated by anthropomorphic animals, and so on. Not all MUDs are games; some are designed for educational purposes, while others are purely chat environments, and the flexible nature of many MUD servers leads to their occasional use in areas ranging from computer science research to geoinformatics to medical informatics to analytical chemistry.[3][4][5][6] MUDs have attracted the interest of academic scholars from many fields, including communications, sociology, law, and economics.[7][8][9] At one time, there was interest from the United States military in using them for teleconferencing.