New Year Lemmings 1991/1992 is a fanmade version of Lemmings, created by a developer called "Gaston^Splatt." The game was released on the public domain during the 1991-1992 Xmas holidays.
This unofficial version of Lemmings is based on Holiday Lemmings, but the author was able to reverse engineer some elements of the game. The lemmings are using the standard sprites (they are not wearing the Santa costume), and five new levels were added. One of the maps is built using the text HAPPY NEW YEAR 1992. Twenty-seven years later this is still fun to play. Happy new year!