More zombies have been killed in the campaign The Passing than the entire population of Michigan, population 10,003,422.
That is almost more than the entire population of Ohio, population 11,485,910!

c6m1_riverbank

Difficulty	Playtime	Points (PPM)	Kills	Restarts
Normal	5.49 months	6,062,605 (27.37)	2,655,384	1,638
Advanced	1.77 weeks	1,137,977 (63.83)	208,408	611
Expert	12.67 hours	17,438 (22.94)	3,914	105
Total	5.95 months	7,218,020 (30.07)	2,867,706	2,354

c6m2_bedlam

Difficulty	Playtime	Points (PPM)	Kills	Restarts
Normal	9.05 months	10,278,902 (28.17)	6,739,166	3,778
Advanced	3.02 weeks	2,008,523 (66.02)	463,885	1,045
Expert	12.00 hours	25,930 (36.01)	6,305	93
Total	9.82 months	12,313,355 (31.09)	7,209,356	4,916

c6m3_port

Difficulty	Playtime	Points (PPM)	Kills	Restarts
Normal	6.36 months	4,611,748 (17.99)	1,244,998	2,372
Advanced	1.96 weeks	1,133,178 (57.34)	86,954	415
Expert	35.00 minutes	1,772 (50.63)	175	0
Total	6.85 months	5,746,698 (20.81)	1,332,127	2,787

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