a lot
Nine levels
14
Sonic:6 Shadow:4
there are about 20 levels
7+1
Around 28
There are exactly 187 missions in Sonic and the Black Knight.
10
yes you can find it in many levels
There are 99 levels on Duck Hunt for Nintendo. The difficulty increases as you progress through the levels and the ducks fly faster and in more unpredictable patterns. Each level consists of three rounds of shooting ducks.
from what i know there are 5 but i think there might be 6 from what i have heard
there are 2 keys per level excluding boss levels