What brings you down but never up?

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.

ENEMY = 2 * LINK
LINK + 2 = HELL

Then what will be TAXI + HELL? Select from the options below:
a) ROTTEN
b) DANGER
c) HEAVEN
4) MORTAL

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

How many triangles are there in the picture below?

What 5-letter word typed in all capital letters can be read the same upside down?

Identify Me

Hint1: I am a god
Hint 2: I am a planet
Hint 3: measurer of heat

Chocolate costs 6 rupees and a Toy costs 5 rupees. If you have 32 rupees in total, how many chocolates and how many Toys can be purchased with that amount?

What has 88 keys?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?