These ten floors shall introduce you to the Squirrels. You're most likely gonna grow to hate them. They attack with a large spread of fire that when it hit, it confuses you. What's worse, as soon as you fight back, they turn tail and run from battle. In order to kill them before they run, you need a gun with an insane amount of attack power(somewhere above 500).

On the 60th floor, you shall encounter the Crab. This one is very similar to the crab from the Warehouse, except it's a lot faster. Casting Haste will greatly help with this battle(actually, it's almost a necessity). Avoid the lasers it fires periodically from it's eyes as they can easily half your HP. The bubbles it shoots also lower your defense. These are hard to avoid, so expect to be hit. Take out its claws as soon as you can so that you don't have to worry about their attacks, then concentrate on the body. If you have the Burst effect on your weapon, that will help too. For winning, you get yet another key.
 

Items to be found

(3)Tool	M712 Monster
FA-MAS Monster	MP5SD6 Rocket
(2)Monster	SP Armor 2 CR Evade+? Type 38 T-card
Full Recover S12 Cr Armor 1 PE+?	Monster B Suit 2
Range+? Defense+?	Full Cure Monster