@@ -249,6 +249,10 @@ eq("finds a hyphenated id", namedLicence("Ships under OFL-1.1 terms.", ["OFL-1.1
 eq("licence in the label is not checked", parseStack(stackMd.replace("[Chips]", "[CC0 Chips]"), { file: "stacks/s1.md", terms: ["CC0"] }).sections[1].picks[0].label, "CC0 Chips");
 eq("pickPath resolves from stacks/", pickPath("stacks/s1.md", "../catalog/2d/x.md"), "catalog/2d/x.md");
 eq("section order constant", STACK_SECTIONS.join(","), "Art,Audio,Fonts,Tools,Gaps");
+throws("licence in the lead", badStack((m) => m.replace("Lead line two.", "All picks are CC0.")), 'stacks/s1.md:11: the lead names a licence ("CC0")');
+throws("licence in a gap", badStack((m) => m.replace("- No parallax layers yet.", "- No CC0 parallax layers yet.")), 'stacks/s1.md:24: the gap names a licence ("CC0")');
+throws("licence in the task", badStack((m) => m.replace('task: "A game: to sell."', "task: A public domain game.")), 'stacks/s1.md:4: the task names a licence ("public domain")');
+throws("licence in the title", badStack((m) => m.replace("title: Make a thing", "title: Make a MIT thing")), 'stacks/s1.md:3: the title names a licence ("MIT")');
 
 /* stacks: owes and page ---------------------------------------------------- */
 import { copyAllText, owes } from "./stacks.mjs";
 
@@ -62,16 +62,26 @@ export function parseStack(text, { file, terms = [] }) {
   if (lines[0] !== "---") fail(0, "a stack starts with frontmatter (---)");
   const end = lines.indexOf("---", 1);
   if (end === -1) fail(0, "frontmatter is not closed with ---");
+  // Licence facts come only from the entries, so no prose in a stack may state one.
+  const noLicence = (i, text, what) => {
+    const named = namedLicence(text, terms);
+    if (named) fail(i, `the ${what} names a licence ("${named}"); licence facts come from the entry`);
+  };
   const meta = {};
+  const metaLine = {};
   for (let i = 1; i < end; i++) {
     const line = lines[i];
     if (!line.trim()) continue;
     const at = line.indexOf(":");
     if (at === -1) fail(i, `frontmatter line "${line.trim()}" is not key: value`);
-    meta[line.slice(0, at).trim()] = unquoteScalar(line.slice(at + 1).trim());
+    const key = line.slice(0, at).trim();
+    meta[key] = unquoteScalar(line.slice(at + 1).trim());
+    metaLine[key] = i;
   }
   for (const key of REQUIRED) if (!meta[key]) fail(0, `frontmatter is missing ${key}`);
   if (!DATE_RE.test(meta.walked)) fail(0, "walked is not YYYY-MM-DD");
+  noLicence(metaLine.title, meta.title, "title");
+  noLicence(metaLine.task, meta.task, "task");
 
   const lead = [];
   let leadLine = null;
@@ -98,20 +108,21 @@ export function parseStack(text, { file, terms = [] }) {
       if (/^#\s/.test(line)) continue; // the page shows the title as its h1
       if (line.trim() && leadLine === null) leadLine = i + 1;
       if (leadLine !== null) lead.push(line);
+      noLicence(i, line, "lead");
       continue;
     }
     if (!line.trim()) continue;
     if (current.name === "Gaps") {
       const g = line.match(/^- (\S.*)$/);
       if (!g) fail(i, "a Gaps line is a bullet (- text)");
+      noLicence(i, g[1], "gap");
       gaps.push({ text: g[1], line: i + 1 });
       continue;
     }
     const m = line.match(PICK_RE);
     if (!m) fail(i, "a pick line is: - **Need:** then a link to the entry, a full stop, and why this pick");
     const [, need, label, href, why] = m;
-    const named = namedLicence(why, terms);
-    if (named) fail(i, `the why sentence names a licence ("${named}"); licence facts come from the entry`);
+    noLicence(i, why, "why sentence");
     current.picks.push({ need: need.trim(), label, href, why, line: i + 1 });
   }
   for (const s of sections) if (!s.picks.length) fail(s.line - 1, `section "${s.name}" has no picks`);
 
@@ -7,7 +7,7 @@ walked: 2026-09-25
 
 # Make a 2D pixel platformer
 
-For a solo developer making a side-view pixel platformer in any engine. The art picks are drawn for a side view. Music comes as two picks: five tracks that need no credit, and a larger album that does.
+For a solo developer making a side-view pixel platformer in any engine. The tiles, characters and background are drawn for a side view. Music comes as two picks: five looping tracks, and an 18-track album for more.
 
 ## Art
 
 
@@ -7,7 +7,7 @@ walked: 2026-09-25
 
 # Make a 3D low-poly arena game in Godot
 
-For a solo developer building a small 3D arena game in Godot 4. The art, audio and font picks work in any engine; the Tools picks are Godot 4 add-ons.
+For a solo developer building a small 3D arena game in Godot 4. The Tools picks are Godot 4 add-ons.
 
 ## Art
 
 
@@ -7,7 +7,7 @@ walked: 2026-09-25
 
 # Make a first-person destruction game
 
-For a solo developer making a first-person game where things break apart. Debris is made ahead of time: fracture a mesh in Blender and ship the pieces, which works in any engine.
+For a solo developer making a first-person game where things break apart. Debris is made ahead of time: fracture a mesh in Blender and ship the pieces.
 
 ## Art
 
 
@@ -15,7 +15,7 @@ For a solo developer making a casual puzzle game for phones: gems for a match-3
 - **Animated gems:** [Rotating Gems for Match-3 (Bondoki)](../catalog/2d/bondoki-rotating-gems.md). Animated gems in seven colours, with heart-bomb and rainbow-bomb special pieces. Delivered as animated GIFs with no licence file inside, so keep a record of the source page.
 - **Cards, dice and pieces:** [Kenney Board Game Pack](../catalog/2d/kenney-boardgame-pack.md). Playing cards, poker chips, dice and pieces in seven colours, with SVG sources and a dozen matching sounds.
 - **Menus and HUD:** [Kenney UI Pack](../catalog/2d/kenney-ui-pack.md). 430 buttons, panels and sliders.
-- **Sparkle effects:** [Kenney Particle Pack](../catalog/shaders-vfx/kenney-particle-pack.md). 80 particle sprites at 512x512 (sparks, glows, soft blobs) for match and combo effects.
+- **Sparkle effects:** [Kenney Particle Pack](../catalog/shaders-vfx/kenney-particle-pack.md). 80 particle sprites at 512x512 (sparks, glows, soft blobs) for GPU particles and canvas effects.
 
 ## Audio