UnMetal

Stage 1
-There is only one secret in Stage 1 and it is found in the same room where you get the encrypted chip for your radio. Go to the back of the room and roll in-between the two computer consoles and punch the wall to reveal a hidden door. Go through the door and destroy the computer console in this hidden room to find the secret.

Stage 2
-The first secret is found after using the raft to cross the first section of the sewers. In the next area, you’ll be attacked by “Human-Piranha-hybrid things.” Immediately in this section you should notice a cutout in the wall with a trash pile in front of it. Destroy the trash pile and then punch the wall in the cutout. Destroy the trash in the hidden room to find this secret.

-The second secret is in a room much later into the sewers, but just before the Sewerjunk boss fight. You’ll enter this room at the bottom of the screen. You should notice a small square of sewer water in the top right section of the screen. Go to this square and put down the raft. Get on the raft and punch the wall to reveal a hidden door.

Stage 3
-The first secret is found in the first officer like room with the world map in the back. Punch the map to reveal the hidden room.

-The second secret can be obtained after you defeat Lt. Markuson. Search his body and take the key card. From here, backtrack to the elevator and go to F2 where you encountered the drones. When you get off the elevator, go west and follow the path to the door. Enter the room and punch the wall in the top right corner of the room to reveal a hidden area.

Stage 4
-The first secret is directly south from where you spawn into the stage. Go down and you’ll see three guards. Take them out, go into the back of the truck and punch the box to reveal the secret.

-After sneaking passed the sleeping dogs and watching the prisoner escape, you’ll immediately notice question marks across the screen and a lone guard in the next area. Go up into the bushes at the top of the screen to the left of the boxes and the heart will spawn.

-The third secret is found in the Basement section of the stage. After defeating Turret Storm, destroy the box in the top left of the screen to find the Basement Key. Pick up the key and leave the room. Go south until you’re in the room with the fire and the bathroom door marked “WC.” Go into the bathroom and punch the wall to the left of the urinal to reveal the hidden room.

-The final secret is found after getting out of the jungle maze but before encountering the the drill sergeant at the base. After exiting the jungle maze, you’ll be in an area with one tree in the middle of the area. Punch the tree to spawn the secret.

Stage 5
-The first secret is actually in the same area where you begin the stage, but you wont be able to access it from the start. It is in the barracks on the left side of the screen. In order to reach it, you’re going to have to go all the way around and loop back to the entrance of the barracks. Once inside, punch the bed on the top right of the room to reveal a grate that you can climb down and reach the secret.

-From the area where the drill Sargent’s barracks (his is the one with a urinal in it) is, go south. Enter the small building on the bottom left side of the screen. Once inside, destroy the box between the grenade box and brown boxes. Then, punch the wall to reveal the hidden doorway.

Stage 6
-The first secret is in the room that has a missile in the middle. On the right side of the missile is stack of greenish brown boxes and green boxes. Exit south and then go to the right side of the next room and then head back up to enter the previous room on the other side of the missile. Destroy the green crates on the right side of the stack with a grenade to reveal a grate that you can climb down.

-The next secret is during the submarine section. It is found in the area that has three mines in the middle with a turret attached to the wall on the right side. Destroy the mines and turret. You should notice that the wall just above the turret is partly damaged. Hit this damaged area with a torpedo to reveal the secret.

Stage 7
-There are two secrets in Stage 7 and they are both in the same area. After exiting the submarine, head west to the next area and then north. The first secret will be behind a hidden door dead center between the brown crates against the north wall. Punch the wall between these crates and the hidden door will be opened. Go inside and then punch the stack of crates in the top left corner of this room to reveal a grate that you can climb down.

-From the previous hidden door, go right and punch the big brown crate that is next to a blue crate in the top right corner. There is a grate underneath that you can climb down.

Stage 8
-The first secret is found in the area where you place the second Mike clone. You should notice a tree in the top left corner next to some barrels. Sneak around the camera and punch the tree until the secret spawns.

-From the area after with the bathroom that is after opening the main gate, take the west exit to find yourself in an area with two cameras, a lot of barrels and big tree to the left. Use an electromagnetic grenade on the first camera and run behind the big tree. There is a door behind this tree that you can’t see. Just keep running along the north wall behind the tree and you’ll eventually find it and go through.

Stage 9
-From the start of this area go north, west, north, and finally west. You should come across four giant gas containers. Three of them will have a yellow triangle marked on them except for one. Punch and destroy the gas container third from the left that has no yellow triangle on it. There is a grate underneath it that you can climb down.

-The next secret is found on the roof. From the elevator entrance on the roof, head all the way south until you see a big water tower on the left side of the screen below the three blue tarps. Roll underneath this tower and punch the air conditioning unit to the right on the other side of the barrels. There is a grate underneath the AC unit.

-The final secret is found in the basement labyrinth. It it is in the very first area of the labyrinth after entering. Go left and punch in the gate to fully open the door way. Go through the now opened gate to find the secret along with a Zelda shoutout. Also, punching in this gate will void the “DO NOT DISTURB” Trophy/Achievement if you don’t already have it.