Murine Corps is a level in Inkwell Isle Three that opens either after beating Sally Stageplay or by completing Rugged Ridge. Either way, a new route opens up leading to a neighborhood area where you will find the level Murine Corps.
Murine Corps is the boss battle starring Werner Werman and should be the third or second to last boss you will fight in Inkwell Isle Three leading to Inkwell Hell. The level is set inside a house, but to be more specific, a mouse hole. This fight has three phases, with the first two being you fighting his custom tank, and the last against his Katzenwagen.
"Zat vas easy as eins, zwei, drei!" —Werner Werman, Phase 1 Death Screen
The player is greeted by Werner Werman using a mechanical hand to light his cigar. He then goes inside his can and the scuffle commences.
Werner Werman will use one of three attacks:
He can pull out a bomb shooter, which shoots out two bombs on Simple, four on Regular or six on Expert. Once they hit the floor, it splits into two projectiles on the floor, which move in both directions.
He can also pull out a catapult, which shoots out five projectiles (four on Simple, six on Expert), two or three of which are wads of pink gum and can be parried. The rest are bolts, bottle caps or coins.
He also has a chance to launch two pink spring platforms that can be parried which boost the players up a lot so you can avoid Werner charging over to the other side. The charge attack can be jump over with precise timing without any jump pads.
When Werner Werman is defeated, he moves to the middle and is shown attempting to use a mechanical arm to launch a roman candle at you, but fails, crashing down to the tank, and destroying the outer layer of his tank, revealing two flamethrowers at the bottom.
"Zis tank iz ze ultimate veapon. You vill not vin!" —Werner Werman, Phase 2 Death Screen
A second platform in the middle is knocked down and bottle caps attached to harmless wooden poles will appear from the sides of the screen. Werner fires his flamers at either the top or bottom level, according to which level his tank is adjusted at. In Regular or Expert Mode, the bottle caps to the side spin to signal that they are going frontwards, and will either do so with one, two or all six bottle caps on a single platform, with Expert Mode activating the caps more often. In Simple Mode, Werner's tank will only move to the sides while his bottle caps remain docile, but harmful.
On Regular or Expert, once he has sustained too much damage, his soup can will malfunction as he attempts to pull the levers and the cat that has been stalking him throughout the fight eats him. In Simple Mode, a knockout is declared and Werner will constantly pull the levers while his tank moves vertically rapidly as if it were broken.
"Hiss! Hiss! Me-e-e-e-ow!!" —Katzenwagen, Final Phase Death Screen
The second platform and the background will be destroyed by Katzenwagen's head. and consume Werner Katzenwagen will attack you in two ways:
When Katzenwagen scratches its claw either to the left or right and tries to nab you up over the middle of the arena. Six to Seven wood pieces fall from the sky after this, their direction dependent on which direction Katzenwagen stretched its claws. The platforms fall one by one, one getting closer to the other side. In Expert Mode, they fall faster.
Katzenwagen summon two Spectral Ratss from its mouth that forms a cell. They toss pink balls that split on the floor and can be parried. They can be defeated. In Expert Mode, Katzenwagen summons four rats and some balls can be blue, effectively making it harder to get an S rank.
Once it is knocked out, Katzenwagen face will fall off, revealing a cockpit with an injured Werner Werman at the controls.
This is one of the few boss levels to not have alterations of any kind in the music.
The fact that the level is similar to both Tom and Jerry, and WWI, is a reference to propaganda cartoons.
The blocks in the bottom-right hand corner shows a toy soldier leaning on some blocks with the letters "M", "D", "H" and "R", a clear reference to Studio MDHR. The letters are stacked in the order "R", "M", "H", "D".
