More zombies have been killed in the campaign Crash Course than the entire population of Illinois, population 12,901,563.
That is almost more than the entire population of Los Angeles-Long Beach-Riverside, CA, population 17,755,322!

c9m1_alleys

Difficulty	Playtime	Points (PPM)	Kills	Restarts
Normal	6.97 months	10,295,230 (36.61)	4,686,070	4,579
Advanced	1.70 months	6,973,868 (101.57)	933,748	1,020
Expert	59.00 minutes	1,037 (17.58)	312	14
Total	8.68 months	17,270,135 (49.36)	5,620,130	5,613

c9m2_lots

Difficulty	Playtime	Points (PPM)	Kills	Restarts
Normal	11.42 months	11,199,993 (24.33)	6,520,063	6,689
Advanced	3.15 months	11,893,683 (93.61)	1,425,501	1,382
Expert	0.00 seconds	0 (0.00)	0	0
Total	1.21 years	23,093,676 (39.31)	7,945,564	8,071

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