 The player also has the option to "nuke" all the remaining lemmings on the screen, converting them to Bombers.This option can be used to abort a level when in a no-win situation, remove any Blockers that remain after the remaining lemmings have been rescued, or end a level quickly once the required percentage of saved lemmings has been reached.The four difficulty groups – "Fun", "Tricky", "Taxing" and "Mayhem" – are used to organise the levels to reflect their overall difficulty.