diff --git a/src/module/mb-assets.js b/src/module/mb-assets.js
index 387c9cb..2e1d4d7 100644
--- a/src/module/mb-assets.js
+++ b/src/module/mb-assets.js
@@ -92,6 +92,67 @@ Hooks.on("renderApplicationV2", (application, element, context, options) => {
     .forEach((el) => el.addEventListener("click", _onClickActorDropperLink));
 });
 
+Hooks.on("renderWallConfig", async (application, element, context, options) => {
+  const doc = application.document;
+  const scope = "mb-assets";
+  const key = "doortile";
+  const defaultValue = null;
+  const value = doc.getFlag(scope, key) ?? defaultValue;
+  const name = `flags.${scope}.${key}`;
+  if (options.parts && !options.parts.includes("body")) return;
+  const dataField = new foundry.data.fields.DocumentUUIDField({
+    type: "Tile",
+    hint: "The tile that should be hidden when the secret door is opened.",
+    nullable: true,
+    required: false,
+    blank: false,
+    initial: null,
+    label: "Door Tile",
+  });
+  const group = dataField.toFormGroup(
+    { hidden: !context.source.door },
+    { disabled: !context.source.door, name, value },
+  );
+  const fieldSet = element
+    .querySelector('select[name="door"]')
+    ?.closest("fieldset");
+  const form = fieldSet?.closest("form");
+  fieldSet.appendChild(group);
+  application.setPosition();
+  form.addEventListener("change", (event) => {
+    if (event.target.name === "door") {
+      const hidden = event.target.value == 0;
+      console.log("PONIES", hidden, event.target.closest("fieldset"));
+      const fieldSet = event.target.closest("fieldset");
+      const formInput = fieldSet.querySelector(`[name="${name}"]`);
+      formInput.disabled = hidden;
+      formInput.closest(".form-group").hidden = hidden;
+    }
+  });
+});
+
+Hooks.on("updateWall", async (doc, changed, options, userId) => {
+  if (!game.user.isActiveGM) {
+    return;
+  }
+  if (!Object.hasOwn(changed, "ds")) {
+    return;
+  }
+  const isOpen = doc.door !== 0 && doc.ds === 1;
+  const scope = "mb-assets";
+  const key = "doortile";
+  const tileUUID = doc.getFlag(scope, key);
+  if (!tileUUID || tileUUID == "null" || tileUUID == "undefined") {
+    return;
+  }
+  const tile = foundry.utils.fromUuidSync(tileUUID);
+  if (!tile || tile.parent.uuid != doc.parent.uuid) {
+    console.log("invalid tile data for door state change", tile, doc);
+    return;
+  }
+  await tile.update({ hidden: isOpen });
+});
+
 Hooks.on("renderChatMessageHTML", (message, html, context) => {
   html
     .querySelectorAll("a.mb-assets-actor-drop-link")