As with its predecessor Lemmings (1991), the Amiga and Atari ST ports contained 10 special two-player levels.
On the cover CD of the German magazine CD Player 02/1994, the "demo version" of the game is the full game instead. The editorial team received two unlabeled disks from Psygnosis - one with the full version and another one with the demo version for the CD - and mixed them up.
Oh No! More Lemmings was available either as a stand-alone game or as a data disk for Lemmings. The stand-alone version cost more. A Windows 95 version of Lemmings was released in 1995, including (nearly) all of the levels from Lemmings and Oh No! More Lemmings. The game was ported to the new operating system (OS) by Visual Sciences.