diff --git a/game/src/core/state_indexes.asm b/game/src/core/state_indexes.asm
index 19f0d92..d83db9d 100644
--- a/game/src/core/state_indexes.asm
+++ b/game/src/core/state_indexes.asm
@@ -4,6 +4,9 @@ SECTION "State Machine Indexes", WRAM0[$C480]
 W_CoreStateIndex:: ds 1
 W_CoreSubStateIndex:: ds 1
 
+SECTION "Transport Option State Indexes", WRAM0[$C57A]
+W_TransportOptionSubSubSubStateIndex:: ds 1
+
 SECTION "Naming Screen State Indexes", WRAM0[$C580]
 W_NamingScreenSubSubStateIndex:: ds 1
 
diff --git a/game/src/pausemenu/core.asm b/game/src/pausemenu/core.asm
index 1a449cc..9c71f8e 100644
--- a/game/src/pausemenu/core.asm
+++ b/game/src/pausemenu/core.asm
@@ -5,10 +5,16 @@ SECTION "Pause Menu Vars 1", WRAM0[$C490]
 W_PauseMenuPerserveSCX:: ds 1
 W_PauseMenuPerserveSCY:: ds 1
 
+SECTION "Pause Menu Vars 2", WRAM0[$C562]
+W_PauseMenuSelectedOption:: ds 1
+
 DEF W_TransportOptionAAvailable EQU $C576
 DEF W_TransportOptionBAvailable EQU $C577
 DEF W_TransportOptionCAvailable EQU $C578
 
+SECTION "Pause Menu Vars 3", WRAM0[$C579]
+W_SelectedTransportOption:: ds 1
+
 SECTION "Pause Menu State Machine 1", ROMX[$4000], BANK[$06]
 PauseMenuStateMachine::
   ld a, [W_CoreSubStateIndex]
@@ -18,17 +24,19 @@ PauseMenuStateMachine::
   dw $4116 ;02
   dw PauseMenuMappingState ;03
   dw PauseMenuInputHandlerState ;04
+  ; Exit states.
   dw $41AE ;05
   dw $41D3 ;06
   dw PauseMenuDoNothingState ;07
   dw $41FC ;08
   dw PauseMenuExitState ;09
-  dw $496F ;0A
-  dw $496F ;0B
-  dw $496F ;0C
-  dw $496F ;0D
-  dw $496F ;0E
-  dw $496F ;0F
+  dw PauseMenuPlaceholderState ;0A
+  dw PauseMenuPlaceholderState ;0B
+  dw PauseMenuPlaceholderState ;0C
+  dw PauseMenuPlaceholderState ;0D
+  dw PauseMenuPlaceholderState ;0E
+  dw PauseMenuPlaceholderState ;0F
+  ; Option 1 (Medawatch) states.
   dw PauseMenuPrepareFadeOutState ;10
   dw PauseMenuFadeOutState ;11
   dw $425D ;12
@@ -39,12 +47,13 @@ PauseMenuStateMachine::
   dw $42DE ;17
   dw $4304 ;18
   dw PauseMenuOpenMedawatchMenuState ;19
-  dw $496F ;1A
-  dw $496F ;1B
-  dw $496F ;1C
-  dw $496F ;1D
-  dw $496F ;1E
-  dw $496F ;1F
+  dw PauseMenuPlaceholderState ;1A
+  dw PauseMenuPlaceholderState ;1B
+  dw PauseMenuPlaceholderState ;1C
+  dw PauseMenuPlaceholderState ;1D
+  dw PauseMenuPlaceholderState ;1E
+  dw PauseMenuPlaceholderState ;1F
+  ; Option 2 (Item) states.
   dw PauseMenuCanOpenItemMenuCheckState ;20
   dw PauseMenuPrepareFadeOutState ;21
   dw PauseMenuFadeOutState ;22
@@ -56,27 +65,29 @@ PauseMenuStateMachine::
   dw $42DE ;28
   dw $4304 ;29
   dw PauseMenuOpenItemMenuState ;2A
-  dw $496F ;2B
-  dw $496F ;2C
-  dw $496F ;2D
-  dw $496F ;2E
-  dw $496F ;2F
+  dw PauseMenuPlaceholderState ;2B
+  dw PauseMenuPlaceholderState ;2C
+  dw PauseMenuPlaceholderState ;2D
+  dw PauseMenuPlaceholderState ;2E
+  dw PauseMenuPlaceholderState ;2F
+  ; Option 3 (Transport) states.
   dw TransportMenuInitState ;30
   dw $43A7 ;31
-  dw $43D1 ;32
-  dw $4418 ;33
-  dw $4483 ;34
-  dw $44B6 ;35
-  dw $44FE ;36
-  dw $452D ;37
-  dw $4540 ;38
-  dw $496F ;39
-  dw $496F ;3A
-  dw $496F ;3B
-  dw $496F ;3C
-  dw $496F ;3D
-  dw $496F ;3E
-  dw $496F ;3F
+  dw TransportMenuCheckInventoryState ;32
+  dw TransportMenuMappingState ;33
+  dw TransportMenuInputHandlerState ;34
+  dw TransportMenuExitState ;35
+  dw TransportMenuCheckIfSelectedOptionAvailableState ;36
+  dw TransportMenuOptionUnavailableState ;37
+  dw TransportMenuLoadOptionStateMachineState ;38
+  dw PauseMenuPlaceholderState ;39
+  dw PauseMenuPlaceholderState ;3A
+  dw PauseMenuPlaceholderState ;3B
+  dw PauseMenuPlaceholderState ;3C
+  dw PauseMenuPlaceholderState ;3D
+  dw PauseMenuPlaceholderState ;3E
+  dw PauseMenuPlaceholderState ;3F
+  ; Option 4 (Save) states.
   dw PauseMenuPrepareFadeOutState ;40
   dw PauseMenuFadeOutState ;41
   dw $425D ;42
@@ -86,20 +97,21 @@ PauseMenuStateMachine::
   dw PauseMenuClearScrollPositionState ;46
   dw $42DE ;47
   dw $4304 ;48
-  dw $490E ;49
-  dw $496F ;4A
-  dw $496F ;4B
-  dw $496F ;4C
-  dw $496F ;4D
-  dw $496F ;4E
-  dw $496F ;4F
-  dw $4918 ;50
-  dw $4935 ;51
-  dw $496F ;52
-  dw $496F ;53
-  dw $4918 ;54
-  dw $4952 ;55
-  dw $496F ;56
+  dw PauseMenuOpenSaveScreenState ;49
+  dw PauseMenuPlaceholderState ;4A
+  dw PauseMenuPlaceholderState ;4B
+  dw PauseMenuPlaceholderState ;4C
+  dw PauseMenuPlaceholderState ;4D
+  dw PauseMenuPlaceholderState ;4E
+  dw PauseMenuPlaceholderState ;4F
+  ; Message display states.
+  dw PauseMenuPrepareMessageBoxState ;50
+  dw PauseMenuDisplayMessageState ;51
+  dw PauseMenuPlaceholderState ;52
+  dw PauseMenuPlaceholderState ;53
+  dw PauseMenuPrepareMessageBoxState ;54
+  dw PauseMenuDisplaySaveDisabledMessageState ;55
+  dw PauseMenuPlaceholderState ;56
 
 PauseMenuFadeOutState::
   cbcallindex $35
@@ -168,7 +180,7 @@ PauseMenuInputHandlerState::
   call ScheduleSoundEffect
   ld a, 1
   call $4A00 ; PauseMenuMaintainCursorAnimation1
-  ld a, [$C562]
+  ld a, [W_PauseMenuSelectedOption]
   ld hl, .table
   ld b, 0
   ld c, a
@@ -177,7 +189,7 @@ PauseMenuInputHandlerState::
   ld [W_CoreSubStateIndex], a
 
 ; Everything between here and the final ret of this function (as in the next 8 lines) is new (as in not present in M3).
-  ld a, [$C562]
+  ld a, [W_PauseMenuSelectedOption]
   cp 3
   ret nz
   ld a, [$C66F]
@@ -321,3 +333,229 @@ TransportMenuInitState::
   ld a, 0
   cbcallindex $B2
   jp IncSubStateIndex
+
+SECTION "Pause Menu State Machine 7", ROMX[$43D1], BANK[$06]
+TransportMenuCheckInventoryState::
+  ld a, 1
+  ld [$C4D9], a
+  ld hl, W_TransportOptionAAvailable
+  ld bc, 8
+  call memclr
+
+.checkTransportOptionA
+  ld a, $A
+  cbcall IsItemInInventory
+  or a
+  jr nz, .checkTransportOptionB
+  ld a, 1
+  ld [W_TransportOptionAAvailable], a
+
+.checkTransportOptionB
+  ld a, $C
+  cbcall IsItemInInventory
+  or a
+  jr nz, .checkTransportOptionC
+  ld a, 1
+  ld [W_TransportOptionBAvailable], a
+
+.checkTransportOptionC
+  ld a, $B
+  cbcall IsItemInInventory
+  or a
+  jr nz, .nextState
+  ld a, 1
+  ld [W_TransportOptionCAvailable], a
+
+.nextState
+  jp IncSubStateIndex
+
+TransportMenuMappingState::
+  ld a, 1
+  ld [$C4D9], a
+  ld bc, $200
+  ld e, $7E
+  ld a, 0
+  cbcall DecompressAttribmap0ScrollAdjusted
+  ld bc, $200
+  ld e, $7E
+  ld a, 0
+  cbcall DecompressTilemap0ScrollAdjusted
+  ld bc, $401
+  ld e, $7F
+  ld a, [W_TransportOptionAAvailable]
+  or a
+  jr z, .hideOptionA
+  ld e, $80
+
+.hideOptionA
+  ld a, 0
+  cbcall DecompressTilemap0ScrollAdjusted
+  ld bc, $403
+  ld e, $7F
+  ld a, [W_TransportOptionBAvailable]
+  or a
+  jr z, .hideOptionB
+  ld e, $81
+
+.hideOptionB
+  ld a, 0
+  cbcall DecompressTilemap0ScrollAdjusted
+  ld bc, $405
+  ld e, $7F
+  ld a, [W_TransportOptionCAvailable]
+  or a
+  jr z, .hideOptionC
+  ld e, $82
+
+.hideOptionC
+  ld a, 0
+  cbcall DecompressTilemap0ScrollAdjusted
+  jp IncSubStateIndex
+
+TransportMenuInputHandlerState::
+  ld a, 1
+  ld [$C4D9], a
+  call $4B3F
+  xor a
+  call $4B88
+  ldh a, [H_JPInputChanged]
+  and M_JPInputB
+  jp z, .bNotPressed
+  ld bc, 1
+  ld a, 7
+  call CGBLoadSingleBGPPaletteIndex
+  ld a, 1
+  ld [W_CGBPaletteStagedBGP], a
+  jp IncSubStateIndex
+
+.bNotPressed
+  ldh a, [H_JPInputChanged]
+  and M_JPInputA
+  ret z
+  ld a, 1
+  call $4B88
+  ld a, $36
+  ld [W_CoreSubStateIndex], a
+  ret
+
+TransportMenuExitState::
+  ld a, 1
+  ld [$C4D9], a
+  ld a, 2
+  ld [$C4EE], a
+  ld a, $A
+  ld [$C4EF], a
+  ld a, 0
+  ld [$C4F0], a
+  ld a, 7
+  ld [$C4F1], a
+  ld a, 0
+  cbcallindex $B3
+  cbcallindex $23
+  ld a, 1
+  ld [$C498], a
+  ld bc, 2
+  ld a, 7
+  call CGBLoadSingleBGPPaletteIndex
+  ld a, 1
+  ld [W_CGBPaletteStagedBGP], a
+  ld a, 6
+  call ScheduleSoundEffect
+  ld a, 4
+  ld [W_CoreSubStateIndex], a
+  ret
+
+TransportMenuCheckIfSelectedOptionAvailableState::
+  ld a, 1
+  ld [$C4D9], a
+  ld a, [W_SelectedTransportOption]
+  ld hl, W_TransportOptionAAvailable
+  ld b, 0
+  ld c, a
+  add hl, bc
+  ld a, [hl]
+  or a
+  jr nz, .optionAvailable
+
+  ld a, 7
+  call ScheduleSoundEffect
+  ld a, $20
+  ld [$C48A], a
+  jp IncSubStateIndex
+
+.optionAvailable
+  ld a, 5
+  call ScheduleSoundEffect
+  xor a
+  ld [W_TransportOptionSubSubSubStateIndex], a
+  ld a, $38
+  ld [W_CoreSubStateIndex], a
+  ret
+
+TransportMenuOptionUnavailableState::
+  ld a, 1
+  ld [$C4D9], a
+  ld a, [$C48A]
+  dec a
+  ld [$C48A], a
+  ret nz
+  ld a, $34
+  ld [W_CoreSubStateIndex], a
+  ret
+
+TransportMenuLoadOptionStateMachineState::
+  ld a, 1
+  ld [$C4D9], a
+  ld a, [W_SelectedTransportOption]
+  rst 0
+  dw $454F
+  dw $46F2
+  dw $487B
+
+SECTION "Pause Menu State Machine 8", ROMX[$490E], BANK[$06]
+PauseMenuOpenSaveScreenState::
+  ld a, $C
+  ld [W_CoreStateIndex], a
+  xor a
+  ld [W_CoreSubStateIndex], a
+  ret
+
+PauseMenuPrepareMessageBoxState::
+  ld a, 1
+  ld [$C4D9], a
+  ld bc, 2
+  ld a, 7
+  call CGBLoadSingleBGPPaletteIndex
+  ld a, 1
+  ld [W_CGBPaletteStagedBGP], a
+  cbcall InitiateMainScript
+  jp IncSubStateIndex
+
+PauseMenuDisplayMessageState::
+  ld a, 1
+  ld [$C4D9], a
+  ld bc, $29
+  ld a, 1
+  cbcall MainScriptLoopHelper
+  ld a, [W_MainScriptExitMode]
+  or a
+  ret z
+  ld a, 4
+  ld [W_CoreSubStateIndex], a
+  ret
+
+PauseMenuDisplaySaveDisabledMessageState::
+  ld a, 1
+  ld [$C4D9], a
+  ld bc, $23
+  ld a, 1
+  cbcall MainScriptLoopHelper
+  ld a, [W_MainScriptExitMode]
+  or a
+  ret z
+  ld a, 4
+  ld [W_CoreSubStateIndex], a
+  ret
+
+PauseMenuPlaceholderState::
+  ret
diff --git a/game/src/pausemenu/items.asm b/game/src/pausemenu/items.asm
index 5b25e55..48db86c 100644
--- a/game/src/pausemenu/items.asm
+++ b/game/src/pausemenu/items.asm
@@ -6,4 +6,34 @@ W_CurrentPageItemSelectionIndex:: ds 1
 W_CurrentItemPage:: ds 1
 
 SECTION "Inventory",  WRAMX[$DE18], BANK[$05] ; 5:D918 in M3
-W_Inventory:: ds $5E
+W_Inventory:: ds $4C
+
+SECTION "Item Helper Functions", ROMX[$5834], BANK[$15]
+IsItemInInventory::
+  ld [$C4EE], a
+  ld a, BANK(W_Inventory)
+  rst 8
+  ld de, W_Inventory
+  ld c, $26
+
+.loop
+  ld a, [de]
+  cp $80
+  jr c, .itemNotFound
+  and $7F
+  ld b, a
+  ld a, [$C4EE]
+  cp b
+  jr z, .itemFound
+  inc de
+  inc de
+  dec c
+  jr nz, .loop
+
+.itemNotFound
+  ld a, 1
+  ret  
+
+.itemFound
+  xor a
+  ret
diff --git a/game/src/version/kabuto/wrappers.asm b/game/src/version/kabuto/wrappers.asm
index d163dc4..b47fcde 100644
--- a/game/src/version/kabuto/wrappers.asm
+++ b/game/src/version/kabuto/wrappers.asm
@@ -74,7 +74,7 @@ CrossBankFunctionTable::
 	dbw $15, $55DF ; 44
 	dbw $15, $560D ; 45
 	dbw $15, $5693 ; 46
-	dbw $15, $5834 ; 47
+	cbpointer IsItemInInventory ; 47
 	dbw $15, $5857 ; 48
 	dbw $15, $58A6 ; 49
 	dbw $15, $58FE ; 4A
diff --git a/game/src/version/kuwagata/wrappers.asm b/game/src/version/kuwagata/wrappers.asm
index 3ac335c..9cb7bc4 100644
--- a/game/src/version/kuwagata/wrappers.asm
+++ b/game/src/version/kuwagata/wrappers.asm
@@ -74,7 +74,7 @@ CrossBankFunctionTable::
 	dbw $15, $55DF ; 44
 	dbw $15, $560D ; 45
 	dbw $15, $5693 ; 46
-	dbw $15, $5834 ; 47
+	cbpointer IsItemInInventory ; 47
 	dbw $15, $5857 ; 48
 	dbw $15, $58A6 ; 49
 	dbw $15, $58FE ; 4A