General options:
Escape for menu
N is New
L is Load
S is Save
A is Save-As
T (or Ctrl+P) to test the map in-game (need to edit mapster.cfg to point to fury.exe)
Q is Quit
RightMousebutton-Hold or -Click is setting position of white-arrow
LeftMousebutton-Hold in 3D-mode to lock onto object
Roll sets starting-position to current white-arrow
Numpad-Enter is entering/leaving 3D-mode
uses arrows to move and A/Z to go higher/lower
Ctrl+A/Z to look Up/Down
MOUSE5 resetting your up/down looking
A/Z is zoom-in/out
Ctrl+Y for step backward aka undo
Ctrl+Shift+Y for step forward aka redo
Backspace is toggling to textured and textured-with-animations in 2D-mode
Tab shows clipboard entries


F-keys in 2D-mode:
F1 for help (not found)
F2 for sound index
F3 for isometrical view
F4 to toggle first sector wall enabling in 2D-mode
F5 for level item-count
F6 for level enemy-count
F7 for sector flags
F8 for wall flags
F9 for sthelp (not found)
F10 to toggle 3D preview window in 2D
F11 while on 3D preview window to cycle through brightness levels
F12 for screenshot

F-keys in 3D-mode:
F1 for 3D-mode help
F2 to toggle clipboard preview
F3 to toggle mouselook
F4 to toggle ambient sounds
F5 to toggle UnrealED mouse navigation which features
Hold-RightMousebutton for mouselook
Hold-LeftMousebutton and drawing mouse to move forward and backward
Hold-RightMousebutton+LeftMousebutton to move on playerview-axis
F6 to toggle automatic sector-effector help (not found)
F7 to toggle automatic sector-tag help
F8 ?
F9 to toggle maphack
F10 ?
F11 to cycle through brightness levels
F12 for screenshot


General options and sector/wall-creation and manipulation:
G is grid-resolution
L is toggling Grid-lock
Space is starting new sector
Backspace is one step back or quit
Alt+S inside sector is making it valid player space
Shift+Del on vertice-point is deleting it
RightCtrl+Del on highlighted wall is deleting sector
Page-up/Page-down is raise/lower CEILING
Alt+D is lowering pointed ceiling to floorlevel and back
Alt+F is make pointed wall to first wall
[/] to angle floor/ceiling
C on hovered wall makes it a circle
Numpad+/- or Mousewheel for vertex resolution
Spacebar to confirm
C to cancel
Insert on wall adds vertices at mousepointer
J rejoins two split neighbouring sectors (press J in first then in second, must be split with RED-line which means two-sided wall)
Shift-Hold gives option to
Z paste slope values
W flip current slope value
See slope value
U gently raise height or adjust speed from special-menu
J gently lower height or adjust speed from special-menu
/ to hide most effectors
Hold-LeftMousebutton on texture for panning
Ctrl-Hold gives option to
Z paste current shade
U paste current Y-panning
See Y-panning
W to paste current picnum (aka make the whole wallloop the same cached picnum+shade+pal+pixelwidth)
D to duplicate sprite
/ to set sprite to NORMAL scaling
Hold-LeftMousebutton on wall-texture for scaling
Hold-LeftMousebutton on floor/ceiling to change slope
Alt-Hold gives option to
Z paste current palette
U to round selection height to 1028
J to round selection height to 128
W for wall fixrepeats
C for sprite correction which applies sizing to sprite if applicable (aka make sprite correct size and height)
Hold-LeftMousebutton on floor/ceiling to change height
Ctrl+Shift-Hold gives option to
X to toggle light preview, always turn back off when done
W paste height value
U randomize height for selected sprites
/ set sprite size to QUARTER size (16/16)
Ctrl+Alt-Hold gives option to
W to cycle through enely skill Lo-Tags
Q to transform enemy and tags to R2 (Respawn-sprite) or back again
Ctrl+Alt+Shift-Hold for special-menu
RightAlt-Hold enters sector selectionmode
LeftMousebutton to drag around selected sectors
RightAlt to deselect sectors again
Insert on selected sector duplicates it
RightShift-Hold enters sprite/vertice selection-mode


Texture options:
V once shows most used textures in map
twice shows texture editor:
T shows categories
E brings to start of maptiles
G for typing number for quicktravel
Page-up/Page-down for sitetravel
Arrows for navigation
Escape to quit
ß/´ is toggling left and right through textures
P is activating parallax on floorceiling
Tab is caching pointed texture
Enter is assigning cached texture
Numpad+- or Mousewheel on texture is changing shade (can only go darker?)
'+S is entering texture shade value
'+Z is cyclemode of camera (Alternative is Capslock)
Alt+Numpad-2/4/6/8 to pan walltexture
Numpad-2/4/6/8 to pan floor/ceiling-texture OR stretch/shrink wall-texture
E on floor/ceiling-texture to expand/compress aka double/half resolution
F to cycle through texture variations aka on floor/ceiling-texture rotating by 45 degrees and on wall-texture shifting down/right/up/left
R on floor/ceiling-texture to toggle relativite alignment (to first wall) and on wall-texture to rotate angular
O on wall-texture to orientate it to floor or ceiling (aka making it non-moving when you adjust the floor/ceiling-height)
Alt+P to toggle Palette from 0-152
| is aligning textures iteratively depending on current wall you point at
M on below red-wall in 3D-mode to mask/unmask it aka making it a visible double-sided and non-solid wall
Shift+M to mask wall only on one side
B makes masked wall blocked (On/Off is Purple/Blue in 2D-mode)
H (Ctrl+H in 2D-mode) to toggle hitscan-flag for shooting through
T on texture to toggle opaqueness levels
1 toggles wall to solid
2 bottom texture swap ("steal" properties from the other side, kind of a hack to allow a wall to have 2 unique properties in one side but less on the other side)
3 floor-over-floor display


Sprite options:
S is new sprite
Del to delete sprites
R to cycle face-, wall- or floor-alignment
,/. is changing sprite alignment rotation (2D or 3D-mode) by 22.5
Ctrl+Page-Up/Page-Down aligns sprite to floor ceiling (or point to floor/ceiling when creating new sprite)
Same as texture buttons: move up/down, shade, palette, blocking, hitscan,
Numpad-2/4/6/8 for shrinking, T for opacity, 1 for one-sided (only relevant for floor or wall-aligned sprites)
F to flip upside-down
C to make it true-centered aka make height relative to actual center as opposed to foot centered
Alt+Q on sprite in 2D-mode to change blend mode
T to make sprite transparent
- to toggle enemy skill preview in 3D-mode


Tag options:
T to edit sector Lo-Tag
Alt+T to edit wall or sprite Lo-Tag
H to edit sector Hi-Tag
Alt+H to edit wall or sprite Hi-Tag
' and T to edit Lo-Tag of pointed wall/sprite/sector or floor/ceiling in 3D-mode
' and H to edit Hi-Tag of pointed wall/sprite/sector or floor/ceiling in 3D-mode
Alt+X set XVEL in 2D-mode
Alt+Y set YVEL in 2D-mode
Alt+D set ZVEL in 2D-mode
Alt+W set OWNER in 2D-mode
Alt+Q set BLEND in 2D-mode
Alt+X set XVEL in 2D-mode
Ctrl++/- to increase/decrease Hi-Tag in 2D-mode
Alt++/- to increase/decrease Lo-Tag in 2D-mode
Shift++/- to increase/decrease EXTRA in 2D-mode
Ctrl/Alt/Shift+I to open special-menu in 2D-mode
Ctrl/Alt/Shift to show available tags for SE and sectors in 2D-mode


Additional information:
mapster32 keyboart-shortcuts - https://wiki.eduke32.com/wiki/Build/Mapster32_Keyboard_Commands
Duke Nukem 3D mapping tutorial - https://infosuite.duke4.net/
Ion-Fury mapping and tutorial - https://furymap.lerppu.net/
Mapping Session by oasiz - https://www.twitch.tv/videos/506079589