Rolling Thunder/Stage 4

Once Albatross has reappeared, start walking to the right and shoot the two Pink Type 1 Maskers, along with the Yellow and Blue Type 2 Maskers. The metal door shortly after is a pistol ammunition room - and once you have obtained the extra ammunition, two more Yellow Type 2 Maskers will drop down onto another platform made up of gray tree trunks from above. Once you have killed them and made it to the other side of this platform, several Gelzos will be flying around at the top of the screen. When they see you, they will swoop down on you, and this will be your chance to kill them. Just after the tree stump, there is a Machine-Gun Bullets room. Once you have obtained the extra ammunition, continue to the right until you see a Pink Type 1 Masker emerge from a metal door. Another pistol ammunition room is on the platform overhead - so once you have jumped up and obtained the extra ammunition, make a short jump onto another overhead platform. Another Pink Type 1 Masker will emerge from the door below this platform and follow you onto another platform made up of gray tree trunks shortly after. Once you have killed him and made it to the other side of this platform, you will see the first instance of a Green Type 2 Masker; two more, along with another Pink Type 1 Masker, are waiting on the ledge below. Once you have disposed of them, you can either jump down to the second ledge on the left, then the third one on the right - or walk off the ledge and fall straight to the bottom if you want to save some time.

Once you have reached the bottom, two Blue Ninjas will materialize from the wall. Soon after, there is an Orange Type 1 Masker and a Yellow Type 2 Masker on yet another platform made up of gray tree trunks. Once you have made it to the top of this platform, two more Blue Ninjas will materialize from the wall and a Blue Type 2 Masker will emerge from the metal door on the left. The second one just below the overhead platform is a pistol ammunition room, and a Pink Type 1 Masker will emerge from the one on the right once you have obtained the extra ammunition. Once you have dropped off the edge of this platform, there are three Panthers pacing around. A fourth one will try to leap on you from the top of the gray tree-trunk platform just before the lava pit. You will have to jump onto each of the platforms over the first half of the pit in turn, watching out for Fire Men along the way. Another Blue Ninja will materialize from the wall on the gray tree-trunk platform at the halfway point. The second half of the pit has considerably more Fire Men than the first; try to avoid shooting them as they will split into three if you do. Once Albatross has made it to the other side of the pit (which is marked by another gray tree-trunk platform), dropped off its edge and walked through the doorway on the right side of the screen, he will proceed to the fifth stage.