diff --git a/src/site-tools.ts b/src/site-tools.ts
index a76c3e3..3a400b2 100644
--- a/src/site-tools.ts
+++ b/src/site-tools.ts
@@ -29,27 +29,6 @@ export function sameOriginSiteUrl(currentUrl, value) {
   return target.href;
 }
 
-export function pixePuzzleNavigationUrl(currentUrl, puzzleKey) {
-  let current;
-  try {
-    current = new URL(String(currentUrl || ""));
-  } catch {
-    return "";
-  }
-  const key = String(puzzleKey || "");
-  const validKey = /^L[1-9]\d{0,5}$/.test(key) ||
-    (/^D\d{4}-\d{2}-\d{2}$/.test(key) &&
-      !Number.isNaN(Date.parse(key.slice(1))));
-  if (
-    current.hostname !== "pixe.frgmt.xyz" ||
-    current.pathname !== "/" ||
-    !validKey
-  ) {
-    return "";
-  }
-  return new URL(`/play/${key}`, current).href;
-}
-
 export function normalizeSiteHeaders(value) {
   if (!isRecord(value)) return {};
   const headers = {};
diff --git a/tests/node/site-tools.test.ts b/tests/node/site-tools.test.ts
index 77774e6..e223554 100644
--- a/tests/node/site-tools.test.ts
+++ b/tests/node/site-tools.test.ts
@@ -3,7 +3,6 @@ import test from "node:test";
 
 import {
   normalizeSiteHeaders,
-  pixePuzzleNavigationUrl,
   sameOriginSiteUrl,
   siteTextExcerpts,
 } from "../../dist/src/site-tools.js";
@@ -23,29 +22,6 @@ test("site helpers resolve relative URLs but reject cross-origin access", () =>
   );
 });
 
-test("Pixe puzzle cards use bounded direct routes on the lightweight DOM backend", () => {
-  assert.equal(
-    pixePuzzleNavigationUrl("https://pixe.frgmt.xyz/", "L12"),
-    "https://pixe.frgmt.xyz/play/L12",
-  );
-  assert.equal(
-    pixePuzzleNavigationUrl("https://pixe.frgmt.xyz/", "D2026-08-06"),
-    "https://pixe.frgmt.xyz/play/D2026-08-06",
-  );
-  assert.equal(
-    pixePuzzleNavigationUrl("https://pixe.frgmt.xyz/play/L1", "L2"),
-    "",
-  );
-  assert.equal(
-    pixePuzzleNavigationUrl("https://example.com/", "L1"),
-    "",
-  );
-  assert.equal(
-    pixePuzzleNavigationUrl("https://pixe.frgmt.xyz/", "../admin"),
-    "",
-  );
-});
-
 test("site.request headers preserve the browser's credential boundary", () => {
   assert.deepEqual(normalizeSiteHeaders({ Accept: "application/json" }), {
     accept: "application/json",