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Procedural world generation
is a process in which the map isn't laid out by level designer
, but rather a set of rules defined, like: each level must have an entry and exit point and a way to connect them; there must not be 2 loot
boxes in each room
; the houses are only built near roads with electricity connected to them.
The positive side of procedural world is that it is never the same. Although players often find out rulesets pretty quick via subconscious, like in left-right in noise detection
Notable examples of games using procedural worlds are Diablo's catacombs and SimCity maps.