explore: hide player (camera) + fix menu close

- UpdatePlayerSprite: when wSlopNoclip is set, jump to .disableSprite so the
  player sprite is hidden -> true free-roam camera (bankable bank, no ROM0 cost).
- SlopExplore was returning carry-set into .exitProceed, which bare-returns and
  assumes a warp will redraw the screen; since noclip doesn't warp, the menu
  window lingered. Now it closes like the B path (SlopMenuRestoreFlags + push
  bank + jp CloseTextDisplay) so the overworld is rebuilt cleanly.
- SL0P.md: document EXPLORE noclip camera + the hooks.

Verified A/B in Pallet: noclip on -> player gone, walls/seams passable; off ->
player back, collision restored, menu closes cleanly.

3 files changed, 22 insertions, 6 deletions

diff --git a/SL0P.md b/SL0P.md
index a498a3eb..9501a0d6 100644
--- a/SL0P.md
+++ b/SL0P.md
@@ -37,17 +37,23 @@ A table-driven cheat menu. Cursor + A to pick, B to back out / close.
 | **ITEMS** | submenu: give ×99 of balls, Rare Candy, Full Restore, Max Revive, Max Elixer, PP Up, and all five evolution stones |
 | **NOWILD** | toggle wild encounters off (shows `ON`) |
 | **REPEL** | refill repel steps |
+| **EXPLORE** | toggle noclip free-roam camera: hides the player + disables collision, so you glide through walls/NPCs/ledges and cross map connection seams seamlessly across the whole overworld. Pick it again to turn off. |
 
 Everything is in `engine/slop_menu.asm`. Adding a new entry = add a name to
 `SlopMenuText`, a `dw Handler` to `SlopMenuHandlers`, and bump `SLOP_MENU_COUNT`.
 Handlers return carry set (a warp/exit was started) or clear (back to the menu),
 and can be submenus or one-shot actions.
 
-Persistent toggle flags live in `wSlopNoWild` (the repurposed unused `wc5d8`).
+Persistent toggle flags: `wUnusedFlag` (NOWILD) and `wSlopNoclip` (EXPLORE, the
+repurposed unused `wUnusedObtainedBadges` at D356).
 
-### TODO
-- **NOCLIP** (walk-through-walls): prototyped, but its hook lands in the full
-  home bank (ROM0). Needs ~5 bytes of home budget reclaimed first.
+**EXPLORE / noclip** hooks the home `CollisionCheckOnLand` (5-byte early-out when
+`wSlopNoclip` is set; ROM0 room was reclaimed by deleting the unreferenced
+`Func_0db5` dead farcall in `LoadMapHeader`) and `UpdatePlayerSprite` in
+`engine/overworld/movement.asm` (jump to its `.disableSprite` path to hide the
+player). The engine's own player-walk + connection-crossing code then carries you
+seamlessly across the world -- see `tools/render_overworld.py` for the ground-
+truth map that proved connections join maps along shared edges with an offset.
 
 ## Build
 
diff --git a/engine/overworld/movement.asm b/engine/overworld/movement.asm
index 165208eb..e4ff3e05 100644
--- a/engine/overworld/movement.asm
+++ b/engine/overworld/movement.asm
@@ -1,6 +1,9 @@
 DEF MAP_TILESET_SIZE EQU $60
 
 UpdatePlayerSprite:
+	ld a, [wSlopNoclip] ; SL0P camera: hide the player sprite while noclipping
+	and a
+	jr nz, .disableSprite
 	ld a, [wSpritePlayerStateData2WalkAnimationCounter]
 	and a
 	jr z, .checkIfTextBoxInFrontOfSprite
diff --git a/engine/slop_menu.asm b/engine/slop_menu.asm
index e3b07fe6..b4b7f78e 100644
--- a/engine/slop_menu.asm
+++ b/engine/slop_menu.asm
@@ -231,8 +231,15 @@ SlopExplore:
 	ld a, [wSlopNoclip]
 	xor $01
 	ld [wSlopNoclip], a
-	scf                            ; carry set -> close menu, back to overworld
-	ret
+; close the menu the same way the B button does (rebuild the overworld) instead
+; of .exitProceed, which only bare-returns and assumes a warp will redraw.
+	pop hl                         ; drop the pushed .afterHandler return address
+	call SlopMenuRestoreFlags
+	ld a, $01
+	ld [wUpdateSpritesEnabled], a
+	ldh a, [hLoadedROMBank]
+	push af
+	jp CloseTextDisplay
 
 ; ===========================================================================
 ; ITEMS submenu: give 99 of the chosen item (stacks via GiveItem)