Metal Gear Rising Walkthrough Part 12 – R-02: Research Facility (Sewer Entrance to Level 2)
Go straight forward and over to the right. When you reach the first junction head into the smaller room first. Here Raiden can find some Repair Nanopaste, if he has not maxed out his supply yet. After that just head into the other room to begin the first Ranked Battle of this File.
Ranked Battle 1: Mastiff
Begin by immediately locking onto the Mastiff. This will make this fight a lot easier as they are very agile opponents. The Mastiff unit is also armored so you need to break through the armor first before you can sever limbs or bring them down. Here is where pulling out the Pole-ARm with the Strong Attack is very handy thanks to its reach. With it on hand, it is an easy fight to get through.
With the first Mastiff down you can head on through to the next part of the sewers with some stairs leading up to the right. Head on up the stairs. Below you there are 2 more Mastiffs. So, wait on the catwalk above for the first to start toward Raiden. When he gets close, use a Ninja Kill on him. After that, run over to the right-hand side of the tunnel and slice through the door to the right of the crates. Head into the adjacent room and over to the left. There is a VR Terminal there. Head through back through the same passage you just came through and Ninja Run up to the catwalk above. This puts Raiden in a great position to get a second Ninja Kill on the remaining Mastiff. Just wait for it to get close to you then drop in for a Ninja Kill. With those 2 dealt with head on forward and and through the gateway on the left-hand side. Head down the hole in front of you.
Once Raiden touches down immediately start moving toward Wolf. There is a boy below that needs help. This is the next ranked battle:
Ranked Battle 2: 9 Tripods.
Immediately start forward. This is one where the Pole-Arm is is going to be very useful. This will ensure that you can easily secure the S-Rank by simply running forward and triggered each of the Tripod groups to drop down onto Raiden. Just start attacking when you hear the alert sound and the Tripods will have no chance of even touching Raiden (aside from the odd one dropping onto him).
When the fight is over turn around and head back toward where Raiden landed. Now take a little time to head back through the tunnel toward the fence. There are 4 Item Boxes along the way: a EMP Grenade, a Holo-Chip (M), Fuel Cell Refill, and Grenade. After that head for the left-hand side of the sewer and slice through the gate on that side. Equip some EMP Grenades. Head forward and drop down the next hole for the next 2 Ranked Battles:
Ranked Battle 3: 3 Raptors
Immediately start by throwing one of the EMP Grenades into the group. This will knock down all 3 and allow for a quick and easy finish of the first one. Be sure to hit it with Zandatsu. After that it is fairly simple, using the Pole-Arm, to slice through the rest of the Raptors. Another quickly thrown EMP grenade will ensure a very quick victory.
There is a cutscene with Raiden talking with George, a kid who got away from the Reseach Facility. At the conclusion of that fight scene turn around and head over to the right to find an item box with a grenade. After that head down the corridor and slice through the door on the left. Head over to the left when you enter the room to find the next VR Terminal. Opposite that Raiden will find a Foil-Line Cardboard box. Grab it, slice through the next 2 doors and get ready for more Ninja Kills.