diff --git a/docs/PROJECT_MAP.md b/docs/PROJECT_MAP.md
index c9d038e..7ad11c8 100644
--- a/docs/PROJECT_MAP.md
+++ b/docs/PROJECT_MAP.md
@@ -370,9 +370,9 @@ The title screen art.
 - functions: buildTitleCells, drawTitle
 - variables: FONT5, TITLE
 
-### src/ui/saves.js (177 lines)
+### src/ui/saves.js (178 lines)
 Saves in IndexedDB, world files (export / import) and the blueprint library.
-- functions: newWorldId, worldWrite, listWorlds, putWorldEntry, worldNewest, deleteWorld, renameWorld, migrateWorlds, saveWorld, newestSave, b64FromBytes, bytesFromB64, gz, exportWorld, importWorldFile, libLoad, libSave, bpEncode, bpValid, bpDecode
+- functions: newWorldId, worldWrite, listWorlds, putWorldEntry, worldNewest, deleteWorld, cleanWorldName, renameWorld, migrateWorlds, saveWorld, newestSave, b64FromBytes, bytesFromB64, gz, exportWorld, importWorldFile, libLoad, libSave, bpEncode, bpValid, bpDecode
 - variables: DB, worldIdTime, worldIdCounter, worldWrites
 
 ### src/ui/session.js (125 lines)
@@ -431,7 +431,7 @@ Previews drawn under the cursor: build ghosts, drill aim and pulses, selections,
 Events from the simulation (emit) turned into sounds, toasts and cards.
 - functions: drainEvents
 
-### src/ui/loop.js (119 lines)
+### src/ui/loop.js (126 lines)
 The frame loop and boot.
 - functions: scanVisible, frame, boot
 - variables: lastT, acc, lastRender, frameMs, simMs, fpsSm, ambientT
diff --git a/docs/agent-log.md b/docs/agent-log.md
index 55fe21b..d82166e 100644
--- a/docs/agent-log.md
+++ b/docs/agent-log.md
@@ -4,6 +4,17 @@ What agents have done, newest first. Add an entry for every piece of work: the d
 note or request it was for, what changed, the files touched, the tests run, and anything left
 open or not verified. Keep each entry short; the git history has the details.
 
+## 2026-10-24: t10 World name box for a new world (Claude Code, Codex)
+
+- `src/shell.html`, `src/styles/style.css`: a Name box across the top of the New world panel.
+- `src/ui/loop.js`: opening the panel fills it with the next `World N` and selects it; Enter in
+  Name or Seed generates. `src/ui/session.js`: `startNewWorld(seed, w, h, name)`.
+- `src/ui/saves.js`: `cleanWorldName` (trim, 40 characters, else a fallback), shared with
+  `renameWorld`.
+- `test/play.py`: a typed name reaches the Worlds list and the pause menu; the default and an
+  all-spaces name both give `World N`. Screenshot `shots/play/new-world.png` checked.
+- Tests: `run_all.py --browser` all pass.
+
 ## 2026-10-24: t7 Option to turn off smooth pan following the mouse (Claude Code, Codex)
 
 - New setting `cameraLead` (Display: "Camera looks toward the pointer", on by default):
diff --git a/src/shell.html b/src/shell.html
index 6aa332f..82cbaeb 100644
--- a/src/shell.html
+++ b/src/shell.html
@@ -50,6 +50,7 @@
       <button class="btn" id="btn-worlds" hidden>Worlds <small>load · rename · delete</small></button>
       <button class="btn" id="btn-new">New world <small>generate</small></button>
       <div class="plate newworld" id="newworld" hidden>
+        <label>Name <input id="nw-name" type="text" maxlength="40" autocomplete="off" spellcheck="false"></label>
         <label>Seed <input id="nw-seed" type="text" inputmode="numeric" autocomplete="off"></label>
         <label>Size
           <select id="nw-size">
diff --git a/src/styles/style.css b/src/styles/style.css
index 0a66982..97329c8 100644
--- a/src/styles/style.css
+++ b/src/styles/style.css
@@ -293,6 +293,7 @@ input.text { background: var(--soot-0); border: 1px solid var(--soot-4); border-
 .newworld { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 8px; padding: 10px; }
 .newworld label { display: flex; flex-direction: column; gap: 4px; font-size: 0.86em; color: var(--ash); }
 .newworld select, .newworld input { background: var(--soot-0); border: 1px solid var(--soot-4); border-radius: 4px; padding: 6px 8px; color: var(--bone); }
+.newworld label:first-child { grid-column: 1 / -1; }
 .newworld .full { grid-column: 1 / -1; }
 .tfoot { text-align: center; color: var(--ash-dim); font-size: 0.82em; font-family: var(--font-mono); }
 #loading { position: fixed; inset: 0; z-index: 30; display: grid; place-items: center; background: rgba(11, 9, 8, 0.86); }
diff --git a/src/ui/loop.js b/src/ui/loop.js
index bfa2565..b12c21e 100644
--- a/src/ui/loop.js
+++ b/src/ui/loop.js
@@ -97,11 +97,18 @@ function boot(hotData) {
   buildTitleCells(); drawTitle();
   $('nw-seed').value = String(Math.floor(Math.random() * 900000) + 100000);
   $('wallet').onclick = () => { playSfx('ui'); openNotebook('Market'); };
-  $('btn-new').onclick = () => { auInit(); playSfx('ui'); $('newworld').hidden = !$('newworld').hidden; if (!$('newworld').hidden) $('btn-generate').focus(); };
+  $('btn-new').onclick = async () => {
+    auInit(); playSfx('ui'); $('newworld').hidden = !$('newworld').hidden;
+    if ($('newworld').hidden) return;
+    try { $('nw-name').value = `World ${(await listWorlds()).length + 1}`; }
+    catch (e) { $('nw-name').value = 'World 1'; }
+    $('nw-name').focus(); $('nw-name').select();
+  };
+  for (const id of ['nw-name', 'nw-seed']) $(id).onkeydown = e => { if (e.key === 'Enter') $('btn-generate').click(); };
   $('btn-generate').onclick = () => {
     const seed = parseInt(String($('nw-seed').value).replace(/\D/g, ''), 10) || Math.floor(Math.random() * 1e6);
     const [w, h] = $('nw-size').value.split('x').map(Number);
-    startNewWorld(seed, w, h);
+    startNewWorld(seed, w, h, $('nw-name').value);
   };
   $('btn-continue').onclick = async () => { auInit(); playSfx('ui'); const sv = await newestSave(); if (sv) startFromSave(sv); else toast('No saved world found.'); };
   $('btn-title-settings').onclick = () => { auInit(); playSfx('ui'); openSettings('Display'); };
diff --git a/src/ui/saves.js b/src/ui/saves.js
index ba6144f..70f0e41 100644
--- a/src/ui/saves.js
+++ b/src/ui/saves.js
@@ -54,11 +54,12 @@ function deleteWorld(id) {
     if (GAME.worldId === id) { GAME.worldId = ''; GAME.worldName = ''; }
   });
 }
+function cleanWorldName(name, fallback) { return String(name).trim().slice(0, 40) || fallback; }
 function renameWorld(id, name) {
   return worldWrite(async () => {
     const list = await listWorlds(), entry = list.find(w => w.id === id);
     if (!entry) return;
-    entry.name = String(name).trim().slice(0, 40) || entry.name;
+    entry.name = cleanWorldName(name, entry.name);
     await DB.put('worlds', list);
     if (GAME.worldId === id) GAME.worldName = entry.name;
   });
diff --git a/src/ui/session.js b/src/ui/session.js
index 9bb585f..61ebd30 100644
--- a/src/ui/session.js
+++ b/src/ui/session.js
@@ -15,13 +15,13 @@ function enterGame() {
   GAME.drag = null; GAME.lmb = GAME.rmb = false; lastBagKey = '';
   hudDirty = true; renderHotbar();
 }
-function startNewWorld(seed, w, h) {
+function startNewWorld(seed, w, h, name = '') {
   auInit();
   showLoading(true, 0);
   setTimeout(async () => {
     try {
       const worlds = await listWorlds();
-      GAME.worldId = newWorldId(); GAME.worldName = `World ${worlds.length + 1}`;
+      GAME.worldId = newWorldId(); GAME.worldName = cleanWorldName(name, `World ${worlds.length + 1}`);
       await putWorldEntry({ id: GAME.worldId, name: GAME.worldName, seed, w, h, createdAt: Date.now(), savedAt: 0, playTime: 0 });
       generateWorld(seed, w, h, null);
       GAME.playTime = 0; GAME.clip = null; GAME.paste = false; GAME.selDrag = null; GAME.tool = 0; GAME.dropMat = 0; GAME.matChosen = false; GAME.wallMat = RSTONE; GAME.filterCfg = { m: [], inv: 0 }; GAME.pieceIdx = 0;
diff --git a/test/play.py b/test/play.py
index f4e7986..3e29684 100644
--- a/test/play.py
+++ b/test/play.py
@@ -41,11 +41,20 @@ with sync_playwright() as p:
     pg.click('#btn-continue'); pg.wait_for_function('GAME.running')
     check('Continue loads the migrated seed and playtime', pg.evaluate('worldSeed === 12345 && GAME.playTime >= 3661 && !!GAME.worldId'))
     pg.evaluate('quitToTitle()')
+    names = {}
     for seed in [222, 333]:
-        if not pg.is_visible('#nw-seed'): pg.click('#btn-new')
-        pg.fill('#nw-seed', str(seed)); pg.click('#btn-generate')
+        if pg.is_visible('#nw-seed'): pg.click('#btn-new')
+        pg.click('#btn-new')
+        pg.wait_for_function("document.activeElement === $('nw-name')")
+        names[seed] = 'Copper Valley' if seed == 222 else pg.input_value('#nw-name')
+        check(f'new world {seed} offers the next default name', pg.input_value('#nw-name') == f'World {2 if seed == 222 else 3}')
+        if seed == 222:
+            pg.fill('#nw-name', names[seed])
+            pg.screenshot(path=str(out / 'new-world.png'))
+        pg.fill('#nw-seed', str(seed)); pg.press('#nw-name' if seed == 222 else '#nw-seed', 'Enter')
         pg.wait_for_function('GAME.running', timeout=20000)
         check(f'new world {seed} shows the Welcome card', pg.evaluate("[...$('cards').children].some(c => c.textContent.includes('Welcome'))"))
+        check(f'pause menu shows world {seed} name', names[seed] in pg.evaluate("() => { openPause(); return $('pause-meta').textContent; }"))
         pg.evaluate('quitToTitle()')
         pg.wait_for_function("!$('title').hidden")
     pg.click('#btn-worlds'); pg.locator('#m-worlds').wait_for(state='visible')
@@ -59,6 +68,7 @@ with sync_playwright() as p:
     pg.set_viewport_size({'width': 1280, 'height': 800}); pg.evaluate("SET.look = 'pixel'")
     ids = pg.evaluate("async () => Object.fromEntries((await listWorlds()).map(w => [w.seed, w.id]))")
     for seed in [222, 333]:
+        check(f'Worlds list shows world {seed} name', pg.locator(f'[data-world="{ids[str(seed)]}"] strong').inner_text() == names[seed])
         row = pg.locator(f'[data-world="{ids[str(seed)]}"]')
         row.get_by_role('button', name='Load', exact=True).click(); pg.wait_for_function('GAME.running')
         check(f'Load switches to seed {seed}', pg.evaluate('worldSeed') == seed and pg.evaluate('GAME.worldId') == ids[str(seed)])
@@ -93,8 +103,11 @@ with sync_playwright() as p:
     check('Continue chooses the most recently saved world', pg.evaluate('worldSeed') == 333)
     pg.evaluate('quitToTitle()')
     if not pg.is_visible('#nw-seed'): pg.click('#btn-new')
+    blank_default = pg.evaluate("listWorlds().then(w => `World ${w.length + 1}`)")
+    pg.fill('#nw-name', '   ')
     pg.fill('#nw-seed', '777'); pg.click('#btn-generate')
     pg.wait_for_function('GAME.running === true', timeout=20000)
+    check('blank new world names use the default', pg.evaluate('GAME.worldName') == blank_default)
     pg.wait_for_timeout(500)
     ev = pg.evaluate
     ev("window._maxStatus = ''; const _ss = setStatus; setStatus = function (s, k) { if (s && s.length > _maxStatus.length) _maxStatus = s; return _ss(s, k); }; 0")