I think that pretty much every level with bombers available could be solved without one, if you were sufficiently versed in the edge cases of how the game worked. I could be wrong, it’s been decades.
No, sorry :) there are levels which absolutely require the sacrifice (regular levels and the special ones too)
Your statement directly conflicts with the initial comment that said "but a few years back I found someone had gone through the whole game without losing a lemming on any level"
Who's right? Who got the sources to back themselves up?
I think they are talking about Lemmings while the initial comment was about Lemmings 2?
Ah, that might be, it's unclear to me. Thanks for trying to clarify!