Now that you've defeated Chill Penguin (you have haven't you?!) Flame Mammoth's level will be significantly easier. After defeating Chill Penguin Flame Mammoth's stage gets frozen over. All the pits of lava no longer exist and so you can cruise through this stage faster than any other.
You'll be able to get both the Heart Tank of this level and the Sub Tank if you have beaten Chill Penguin.
After you rush through several sets of conveyor belts (just run underneath!) you'll come to a wall with a large health power-up. Grab it, then fall down the pit. This next room contains many platforms with pick axe throwing robots. First, run to the bottom right corner and grab the Heart Tank.
Secondly, climb up to the very top left, kill the two helmet bots and grab the extra life. Dash jump off the platform to the left, and climb the wall up to the Sub Tank. Wall jump on the blocks in front of it to destroy them, then climb through the gap and grab your new gift.
Flame Mammoth
A heavy set fellow to say the least, Flame Mammoth slightly mimics Guts Man by having the ability to shake the ground after jumping.
Reward
Fire Wave! Your own personal flame thrower. This powerful short ranged weapon will come in handy when looking for Heart Tanks and other items.