How many Call of Duty: Black Ops games are there?
5
3
4
3
5
4
3
5
4
1
3
2
5
4
1
3
2
5
4
1
3
2
5
4
1
3
2
5
4
1
3
2
5
4
1
3
2
5
4
1
3
2
5
4
1
3
2
5
4
1
3
2
5
6
4
1
3
2
5
6
4
1
3
2
5
6
4
1
3
2
5
6
4
1
3
7
2
5
6
4
1
3
7
2
5
6
4
1
3
7
2
5
6
4
1
3
7
8
2
5
6
4
1
3
7
8
2
5
6
4
1
7
8
2
5
6
1
7
8
0
2
6
1
9
7
8
2
6
9
7
8
6
9
7
8
6
9
7
8
6
9
7
8
6
9
7
8
6
9
7
8
10
6
9
7
8
10
6
13
9
7
8
10
6
13
9
7
8
10
11
13
9
7
8
10
11
13
9
7
8
10
11
13
9
7
8
10
11
13
9
8
10
11
13
9
8
12
10
11
13
9