The trip there and back again... is the fourth level of the KICKASS difficulty in New Year Lemmings 1991/92.
Strategy[]
Make the second Lemming a Blocker to isolate the first as Trailblazer. Have him build over the pond, under the Ice Spike Trap about 3/4 into the thick part of the upper snow, then up to the top layer. Max out the Release rate and bomb the blocker when the way to the Exit portal is complete.