E2M3: Rook to King's Bishop

Rook to King's Bishop or King's Bishop is the third level of Corrupt Mischief. The level's name is a reference to the game of chess.

The player must search for the Silver Key and Gold Key in order to proceed.

Quick Level Completion

 * The Silver Door is to the left of the start.
 * Proceed forward and enter the next room.
 * Go through the Door in the upper right corner of the room.
 * Head around the pillar, then collect the Silver Key in the upper left corner of the room.
 * Go through the Silver Door, then head down the corridor.
 * Continue following the corridor as it veers right, then enter the next room.
 * Press the Floorplate in the middle of the room.
 * Turn left and proceed into the alcove, then press the Button.
 * Return to the starting room, then turn left and enter the next room.
 * Ascend either staircase, then go through the doorway.
 * Proceed down the corridor to the end, then turn right.
 * Head down the corridor to a set of 3 Moving Platforms.
 * Jump on the 3 Moving Platforms to cross the pit of Lava.
 * Proceed down the corridor on the opposite side.
 * Press the Button at the end to descend down the Elevator.
 * Turn around at the bottom of the Elevator and step onto the platform.
 * Proceed to the opposite side of the platform, then press the Button.
 * Turn left and drop off the platform, then turn around.
 * Press the Button on the right side of the alcove.
 * Turn around and proceed up the corridor to an intersection.
 * Turn left and proceed down the corridor, passing the Gold Door to your left.
 * Turn left at the end and proceed down the corridor.
 * Turn right to enter the alcove, then collect the Gold Key.
 * Return to the Gold Door, then go through it.
 * Proceed down the ramp, then continue straight ahead to the exit.

Walkthrough
Turn left and collect the Shells. Straight ahead is the Silver Door. Turn left once more and collect the 2 Nails in the alcove. Turn around, then proceed forward to collect the Double-Barrelled Shotgun. Collect the two 25 Health to your right, then go through the doorway straight ahead. Collect the 2 Nails as you enter the room. Turn left to kill the 2 Scrags, then turn around to kill another 2 Scrags. Ignore the staircases to the left and instead proceed straight ahead to collect the Shells. Turn left and proceed past the staircase to your left, then kill the 2 Rottweilers at the end of the corridor. Ignore the Door to the right and instead turn left. Proceed down the corridor, ignoring the Door to your right, to kill the Fiend. At the end of the corridor, turn right and collect the Rockets in the alcove. Proceed forward and hit the Wall to reveal a room beyond  (#1) . Return to the last previously ignored Door and go through it. Turn left to kill the Ogre. Proceed down the passageway to collect the two 25 Health, Shells, and Super Nailgun. Return to the previous room and go up either staircase you previously ignored. Collect the two 25 Health and 5 Shells spread around the wooden platform. Straight ahead is another Door, though this one is locked at the moment. Turn around and head back down either staircase, then go through the previously ignored Door in the lower left corner of the room. Collect the 25 Health to your left and Shells to your right, then go around the right side of the pillar straight ahead to reach the opposite side of the room. Collect the Nails on the near side, Rockets and 25 Health in the middle, and Silver Key on the far side. 2 Walls will lower on the right wall, 1 in each corner, as you collect the Silver Key. The Pillar to the left will also lower, turn towards it to kill 3 Scrags floating over a pool of Water. Dive into the Water to collect a Grenade Launcher, then return to the surface. Look towards the wall with the two new doorways, then go through the right one and descend down the staircase. Proceed forward to collect the Shells, then turn right to kill 2 Ogres. Collect the two 25 Health in the corner, then turn left. Ignore the corridor to the left and instead proceed straight ahead. Collect the Nails and 2 Shells as you proceed down the corridor, then turn right. Straight ahead is the Gold Key, but it is blocked off by a set of Bars that open elsewhere. Kill the 2 Ogres inside the Bars, then aim upwards to kill another 2 Ogres on a platform above. Return to the last previously ignored corridor and start to head down it. The Gold Door is to your right, so instead proceed forward. At the end of the corridor is a passageway to the left and right. Ignore the corridor to the right and instead turn left. Kill the 2 Ogres and collect the 25 Health in the upper right corner. To your left is the staircase you previously ignored by the Silver Key. Turn around, then proceed down the corridor. Collect the Nails, Shells, and Rockets while heading down the corridor. Turn left to look at a Button, this is also blocked off by a set of Bars. Kill the Ogre and Fiend inside the Bars, then aim upwards and kill 2 Ogres on the platform above.

Return to the Silver Door and go through it. Kill the Ogre, then start to proceed down the corridor. Turn left to kill a Knight in an alcove, then turn around to kill another Knight in a second alcove. Turn left, then start to proceed down the corridor once more. Turn right to kill a Knight in an alcove, then turn around to kill another Knight in a second alcove. Collect the 25 Health in the alcove in front of you, then turn right and start to proceed down the corridor once more. Collect the Shells and 25 Health in the corridor. Turn right to kill a Knight in an alcove, then turn around to kill another Knight in a second alcove. Turn right and proceed down the corridor once more, then collect the Rockets further up. Follow the corridor as it veers to the right, then proceed forward into the next room. 4 Nail Traps, 1 in each corner of the room, fire diagonally across to another Nail Trap. Collect the 25 Health and 2 Nails on the left side of the room, then turn right to collect the 2 Shells and Nailgun on the opposite side of the room. Turn around, then proceed to the middle of the room to press a Floorplate. This will lower 3 Walls; 1 in front of you with a Button, 1 to your right with a Green Armor, and 1 behind you. Proceed straight forward and press the Button in the alcove, the other two alcoves would simply Teleport you to the middle of the room, meaning the Green Armor is impossible to retrieve. You will receive a message that - "A Door has been opened... somewhere".

Return to the staircase in the room next to the starting room and ascend it. The Locked Door at the top has been opened, go through it and kill the Fiend. Proceed down the corridor while collecting the Shells, Nails, and two 25 Health. Turn right at the end of the corridor to kill 2 Death Knights. Proceed down the next corridor while collecting the Rockets. Jump on the 3 Moving Platforms straight ahead to get across the pit of Lava. Kill the 2 Ogres on the opposite side, then proceed down the corridor to the next room. Collect the Grenade Launcher and Red Armor on the left side of the room, then proceed forward to the Elevator. Press the Button to cause the Elevator to descend, then turn around and step onto the next platform. You are now on the platform with the 2 Ogres on the top of the room with the Button blocked off by the Bars. Collect the two 25 Health on the platform, then press the Button on the far side to lower the Bars below. Turn left and drop to the lower floor, then turn around to enter the room. Collect the Nails to your left, then press the Button to your right. You will receive the message - "You hear gears turn and stones grind...". Return to the Bars in front of the Gold Key, which have now lowered, and enter the room to the right. Collect the Gold Key in the upper left corner. Head to the dark corner in the upper right corner of the room, then hit the Wall to reveal a Teleporter behind. You are now on the platform with the 2 Ogres above the Gold Key room. Collect the Quad Damage on the opposite side of the platform, then turn right and drop off the platform. Return to the Gold Door and go through it. Kill the Shambler, then descend the ramp to collect the 25 Health at the bottom. Proceed through the End Tunnel straight ahead to exit the level.

Differences from Easy to Normal

 * 3rd Scrag in lower left corner of dual-staircase room.
 * 3rd Scrag in lower right corner of dual-staircase room.
 * 3rd and 4th Rottweiler beside Door in upper right corner of dual-staircase room.
 * 2nd Fiend under staircases of dual-staircase room.
 * Death Knight in alcove by  (#1) .
 * 2nd Ogre in Super Nailgun room.
 * 4th and 5th Scrag over pool of Water.
 * Death Knight on platform above Gold Key room.
 * Rottweiler behind Silver Door.
 * 2 Rottweilers at bend of corridor leading to 4 Nail Trap room.
 * 2nd Fiend behind Locked Door at top of dual-staircase room.
 * 3rd Death Knight in corridor before 3 Moving Platforms.
 * 3rd Ogre in corridor after 3 Moving Platforms.
 * Fiend at bottom of ramp leading to exit.

Differences from Normal to Hard/Nightmare

 * 5th and 6th Rottweiler beside Door in upper right corner of dual-staircase room.
 * Fiend on upper platform of dual-staircase room.
 * 6th and 7th Scrag over pool of Water.
 * No 25 Health in alcove of corridor after Silver Door.
 * Fiend in corridor beside room with Nail Trap.
 * 3rd Fiend behind Locked Door at top of dual-staircase room.
 * 4th Death Knight in corridor before 3 Moving Platforms.
 * 4th and 5th Ogre in corridor after 3 Moving Platforms.
 * No 25 Health on top of platform above Button room blocked off by Bars.
 * Shambler at bottom of ramp leading to exit.
 * 2nd Fiend at bottom of ramp leading to exit.
 * Vore at exit.

Differences

 * Rockets beside Double-Barrelled Shotgun in Single Player start room.
 * 2 Nails in front of staircases in dual-staircase room.
 * Rocket Launcher on upper platform of dual-staircase room.
 * Ring of Shadows, Cells, and Rockets in  (#1) .
 * Rockets in front of pool of Water, beside Door leading to dual-staircase room.
 * No Pillar, instead pool of Water already accessible.
 * Silver Key replaced with Nails.
 * Thunderbolt in pool of Water.
 * No Silver Door or Gold Door.
 * Cells and Nails in corridor beyond prior Silver Door location.
 * Double-Barrelled Shotgun in corridor before 3 Moving Platforms, dual-staircase side.
 * 2 Nails in corridor after 3 Moving Platforms, Red Armor side.
 * No Gold Key.
 * Super Nailgun and Cells in prior Gold Key alcove.

Spawn Locations

 * Nail Trap room
 * Upper platform of dual-staircase room.
 * Corridor before 3 Moving Platforms, dual-staircase side
 * Beside pool of Water, near Door leading to dual-staircase room.
 * Bottom of ramp leading to exit.
 * Beside Bars of alcove with Button.
 * Behind staircase in dual-staircase room.