Complete the table series riddle by finding the number that can replace "??".

You need to complete the maze by entering from the entrance marked below in the figure near the yellow circle, bottom left and leaving from the exit point near the green circle, bottom middle.

Rule of Game: You can move only by exchanging green and yellow circles.

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

A bomb exploded in a room full of married couples and no one died. How?

Can you write down eight eights so that they add up to one thousand?

Can you count the number of quadrilaterals in the picture below?

I start and end with 500 and carry a 5 in my heart. But I require the first letter and the first number to be complete. I am the name of a King.

Who am I ?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

Can you count the number of triangles in the picture below?

You are given four results as below:
1111 = F
2222 = E
3333 = T
Then, can you find out how to code 4444?