How many Call of Duty: Black Ops games are there?
5
3
2
3
2
3
5
2
3
4
5
2
3
4
5
2
3
4
5
2
3
4
5
2
3
4
5
2
3
4
1
5
2
3
4
1
5
2
3
4
1
5
2
3
4
1
5
2
3
4
1
6
5
2
3
4
1
6
5
2
3
0
4
7
1
6
5
2
3
4
7
1
6
5
2
3
4
7
1
6
5
2
3
4
7
1
6
5
2
3
4
7
1
6
5
2
3
4
8
7
1
6
5
2
4
8
7
1
6
5
4
9
8
7
1
6
5
4
9
8
7
1
10
6
9
8
7
1
10
6
9
8
7
1
10
6
9
8
7
1
10
6
9
8
7
1
10
6
9
8
11
7
1
10
6
9
8
11
7
13
10
6
12
9
8
11
7
13
10
6
12
9
8
11
7
13
10
6
12
9
8
11
7
13
16
10
6
12
9
8
11
7
13
16
10
66
62
59
57
256
63