Two-player levels were included in the Amiga, Atari ST and both the Super NES and Genesis/Mega Drive ports of Lemmings, using a split screen mode. Player one had normal blue Lemmings whereas player two had Lemmings with blue hair and green clothes, which also started out walking to the left rather than the right.
The aim was to get the most Lemmings into the exit with your colored flag waving above it, no matter what color the Lemming itself is.
The more Lemmings you get in your exit, the more you start with on the next level.
The Original Lemmings features 20 Two-player levels.
Oh No! More Lemmings also features 10 Two-player levels.
Genesis-exclusive levels are marked in bold.