Left 4 Dead will work between Mac and PC Left 4 Dead will work between Mac and PC Left 4 Dead will work between Mac and PC Left 4 Dead will work between Mac and PC Left 4 Dead will work between Mac and PC Left 4 Dead will work between Mac and PC Left 4 Dead will work between Mac and PC Left 4 Dead will work between Mac and PC Left 4 Dead will work between Mac and PC