Christmas Bonus is the second level in Xmas Lemmings 1991.
Strategy[]
Make a Lemming a Climber while it is facing left to become your Trailblazer. Have the others start building their way out of the pit, saving the last for the end. A Miner about halfway up the rock formation should create a safe landing on the other side of the gap. Build and bash the rest of the way to the Exit portal, and be sure the herd is freed with at least a minute and a half left.