How many bosses are there in Metroid for NES?
3
2
2
3
2
3
2
3
2
3
2
4
3
2
4
3
2
5
4
3
2
5
4
3
2
5
1
4
3
2
5
1
4
3
2
5
1
4
3
2
5
1
4
3
2
5
1
4
3
2
5
1
4
3
2
5
6
1
4
0
3
2
5
6
1
4
3
2
5
6
1
4
3
2
5
6
1
4
3
2
5
6
1
4
3
7
5
6
1
4
3
7
5
6
1
4
7
8
5
6
1
4
7
8
5
6
1
4
7
8
5
6
1
4
7
8
5
6
1
7
8
9
5
6
1
7
8
9
6
1
7
8
9
6
10
1
11
7
8
9
6
10
11
7
8
9
6
10
11
7
8
9
6
10
11
7
13
8
9
6
10
11
7
13
8
9
12
6
10
11
7
13
8
9
12
6
10
11
7
13
8
9
12
10
11
7
13
8
9
12
10
11
7
66
256
102
62
63
132
77