diff --git a/.github/workflows/release-sdk.yml b/.github/workflows/release-sdk.yml
index 0baea01..2cbd8a0 100644
--- a/.github/workflows/release-sdk.yml
+++ b/.github/workflows/release-sdk.yml
@@ -97,5 +97,5 @@ jobs:
         See README.md for the author quickstart and the
         wasm ABI this SDK targets.
         NOTES
-        gh release create "$TAG" --target "$GITHUB_SHA" \
+        gh release create "$TAG" --target "$GITHUB_SHA" --latest=false \
           --title "$TAG" --notes-file .artifacts/sdk-release-notes.txt
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 6724eab..7f0d7c9 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -123,5 +123,6 @@ jobs:
     with:
       tools-ref: f412061a7a3f0914db9e09d1159e69504aee8706
       binary: termcade
+      extra-files: THIRD_PARTY_NOTICES.txt
       tag: ${{ needs.identity.outputs.tag }}
       artifact-id: ${{ needs.accept-cli.outputs.artifact-id }}
diff --git a/.gitignore b/.gitignore
index 8e8f4f0..2c0854f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,6 +7,7 @@ games/*/build/
 # …except the starter pack, embedded in the Rust binary. These committed
 # content assets come from termcade-games; ABI-v1 packages remain compatible.
 !internal/starter/packs/*.tcade
+!internal/plugin/testdata/legacy-starters/*.tcade
 game.wasm
 
 .artifacts/
@@ -15,3 +16,5 @@ __pycache__/
 
 /target/
 /internal/plugin/testdata/*/target/
+
+.playwright-cli/
diff --git a/Cargo.lock b/Cargo.lock
index 1516224..67440ab 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2631,7 +2631,7 @@ dependencies = [
 
 [[package]]
 name = "termcade"
-version = "0.1.0"
+version = "0.1.1"
 dependencies = [
  "anyhow",
  "crossterm",
@@ -2702,7 +2702,7 @@ dependencies = [
 
 [[package]]
 name = "termcade-sdk"
-version = "0.1.0"
+version = "0.1.1"
 dependencies = [
  "serde",
  "serde_json",
diff --git a/Cargo.toml b/Cargo.toml
index cba378a..51eaf72 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -5,7 +5,7 @@ resolver = "3"
 
 [package]
 name = "termcade"
-version = "0.1.0"
+version = "0.1.1"
 edition = "2024"
 rust-version = "1.94"
 publish = false
diff --git a/THIRD_PARTY_NOTICES.txt b/THIRD_PARTY_NOTICES.txt
new file mode 100644
index 0000000..16a98a1
--- /dev/null
+++ b/THIRD_PARTY_NOTICES.txt
@@ -0,0 +1,32 @@
+The seeded random compatibility implementation and seeding data in
+internal/random derive from the Go 1.27.3 math/rand implementation.
+Sources: src/math/rand/rng.go and src/math/rand/rand.go in the Go distribution.
+https://go.googlesource.com/go/+/refs/tags/go1.27.3/src/math/rand/
+
+Copyright 2009 The Go Authors.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+   * Neither the name of Google LLC nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/internal/plugin/src/lib.rs b/internal/plugin/src/lib.rs
index 8e14d35..f1326f6 100644
--- a/internal/plugin/src/lib.rs
+++ b/internal/plugin/src/lib.rs
@@ -137,7 +137,7 @@ impl Runtime {
         {
             bail!("invalid host playfield requirements");
         }
-        if shape.cols == 0 || shape.rows == 0 || shape.cols > 3 || shape.rows > 3 {
+        if shape.cols == 0 || shape.rows == 0 || shape.cols > 32 || shape.rows > 32 {
             bail!("invalid host cell subdivision");
         }
         let module = self.compile(key, wasm)?;
diff --git a/internal/plugin/src/tests.rs b/internal/plugin/src/tests.rs
index a322c3a..04505d0 100644
--- a/internal/plugin/src/tests.rs
+++ b/internal/plugin/src/tests.rs
@@ -55,9 +55,55 @@ async fn rust_sdk_guest_roundtrip_keeps_ticks_keys_pixels_hud_gameover_and_reset
 }
 
 #[tokio::test]
-async fn original_published_go_starters_run_in_the_rust_host_at_every_density() {
+async fn rust_sdk_guest_supports_browser_framebuffers_above_terminal_density() {
     let runtime = Runtime::new().unwrap();
-    let packs = PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("../starter/packs");
+    let wasm = fs::read(fixture("probe")).expect("build the locked Rust WASIp1 probe first");
+    for scale in [4, 8, 16, 32] {
+        let shape = CellShape::host(scale, scale);
+        let mut game = runtime
+            .load("browser-probe", &wasm, info(), shape.clone())
+            .await
+            .unwrap();
+        let mut canvas = Canvas::new(16, 8, BLACK, shape);
+        assert_eq!(canvas.pixel_size(), (16 * scale, 4 * scale));
+        game.reset().await.unwrap();
+        game.key(Key::A, true).await.unwrap();
+        game.update().await.unwrap();
+        game.draw(&mut canvas).await.unwrap();
+        assert_eq!(game.score().await.unwrap(), 10);
+        assert_eq!(canvas.pixels().iter().filter(|&&p| p != BLACK).count(), 2);
+        game.key(Key::A, false).await.unwrap();
+        game.draw(&mut canvas).await.unwrap();
+        assert_eq!(canvas.pixels().iter().filter(|&&p| p != BLACK).count(), 1);
+        assert!(game.error().is_none());
+    }
+}
+
+#[tokio::test]
+async fn legacy_go_starter_fixtures_run_in_the_rust_host_at_every_density() {
+    let root = PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("testdata/legacy-starters");
+    let source: serde_json::Value =
+        serde_json::from_slice(&fs::read(root.join("SOURCE.json")).unwrap()).unwrap();
+    for row in source["packages"].as_array().unwrap() {
+        assert_eq!(
+            format!(
+                "{:x}",
+                Sha256::digest(fs::read(root.join(row["file"].as_str().unwrap())).unwrap())
+            ),
+            row["sha256"].as_str().unwrap()
+        );
+    }
+    check_game_packages("testdata/legacy-starters").await;
+}
+
+#[tokio::test]
+async fn current_starters_run_in_the_rust_host_at_every_density() {
+    check_game_packages("../starter/packs").await;
+}
+
+async fn check_game_packages(relative: &str) {
+    let runtime = Runtime::new().unwrap();
+    let packs = PathBuf::from(env!("CARGO_MANIFEST_DIR")).join(relative);
     let mut count = 0;
     for entry in fs::read_dir(packs).unwrap() {
         let path = entry.unwrap().path();
diff --git a/internal/plugin/testdata/hang-rust/Cargo.lock b/internal/plugin/testdata/hang-rust/Cargo.lock
index b276e0d..6879739 100644
--- a/internal/plugin/testdata/hang-rust/Cargo.lock
+++ b/internal/plugin/testdata/hang-rust/Cargo.lock
@@ -95,7 +95,7 @@ dependencies = [
 
 [[package]]
 name = "termcade-sdk"
-version = "0.1.0"
+version = "0.1.1"
 dependencies = [
  "serde",
  "serde_json",
diff --git a/internal/plugin/testdata/legacy-starters/SOURCE.json b/internal/plugin/testdata/legacy-starters/SOURCE.json
new file mode 100644
index 0000000..8e239c7
--- /dev/null
+++ b/internal/plugin/testdata/legacy-starters/SOURCE.json
@@ -0,0 +1,24 @@
+{
+  "origin": "Termcade vendored Go starter packages preserved from main 9de13d1af144a89ba2ec1123b73b707a7f1bff60",
+  "purpose": "immutable legacy ABI compatibility fixtures; never installed as current starters",
+  "packages": [
+    {
+      "file": "asteroid.tcade",
+      "id": "aviorstudio/asteroid",
+      "version": "0.0.2",
+      "sha256": "0d705e21e932e3c0e6bc8cc7534caad47fbdb8b701998928d73a4169f53385a0"
+    },
+    {
+      "file": "brickough.tcade",
+      "id": "aviorstudio/brickough",
+      "version": "0.0.2",
+      "sha256": "3896be61e1499687a9fb26241923a3a79a2bd5c56d2875c3091016ec17ee50b5"
+    },
+    {
+      "file": "tetris.tcade",
+      "id": "aviorstudio/tetris",
+      "version": "0.0.2",
+      "sha256": "cb5a5d8832bebb9501445ae03889ca5f3bcf9cb28da56344befed57b644a29be"
+    }
+  ]
+}
diff --git a/internal/plugin/testdata/legacy-starters/asteroid.tcade b/internal/plugin/testdata/legacy-starters/asteroid.tcade
new file mode 100644
index 0000000..047b5ae
Binary files /dev/null and b/internal/plugin/testdata/legacy-starters/asteroid.tcade differ
diff --git a/internal/plugin/testdata/legacy-starters/brickough.tcade b/internal/plugin/testdata/legacy-starters/brickough.tcade
new file mode 100644
index 0000000..4b92b47
Binary files /dev/null and b/internal/plugin/testdata/legacy-starters/brickough.tcade differ
diff --git a/internal/plugin/testdata/legacy-starters/tetris.tcade b/internal/plugin/testdata/legacy-starters/tetris.tcade
new file mode 100644
index 0000000..113fab5
Binary files /dev/null and b/internal/plugin/testdata/legacy-starters/tetris.tcade differ
diff --git a/internal/plugin/testdata/probe-rust/Cargo.lock b/internal/plugin/testdata/probe-rust/Cargo.lock
index 8b1f7c9..813a7b3 100644
--- a/internal/plugin/testdata/probe-rust/Cargo.lock
+++ b/internal/plugin/testdata/probe-rust/Cargo.lock
@@ -95,7 +95,7 @@ dependencies = [
 
 [[package]]
 name = "termcade-sdk"
-version = "0.1.0"
+version = "0.1.1"
 dependencies = [
  "serde",
  "serde_json",
diff --git a/internal/starter/SOURCE.json b/internal/starter/SOURCE.json
new file mode 100644
index 0000000..ab3db9d
--- /dev/null
+++ b/internal/starter/SOURCE.json
@@ -0,0 +1,46 @@
+{
+  "repository": "https://github.com/aviorstudio/termcade-games",
+  "source_commit": "863a053cab6672c77b4863d4876a69ffbad687e7",
+  "implementation": "Rust WASIp1, ABI 1",
+  "packages": [
+    {
+      "file": "asteroid.tcade",
+      "id": "aviorstudio/asteroid",
+      "version": "0.1.0",
+      "tag": "asteroid-v0.1.0",
+      "sha256": "7fbafb0f2b2b3100c41dfb225d26ee512ada85a57c3518ea957864d7aaad69bb",
+      "bytes": 42780,
+      "width": 72,
+      "height": 40,
+      "release_ci": 41228408956,
+      "attestation_verified": true,
+      "marketplace_verified": true
+    },
+    {
+      "file": "brickough.tcade",
+      "id": "aviorstudio/brickough",
+      "version": "0.1.0",
+      "tag": "brickough-v0.1.0",
+      "sha256": "7289719ea5a66e607188b5623ac61bae492f8a2f90a559abcfa83083b6cf148c",
+      "bytes": 31472,
+      "width": 64,
+      "height": 40,
+      "release_ci": 41228411148,
+      "attestation_verified": true,
+      "marketplace_verified": true
+    },
+    {
+      "file": "tetris.tcade",
+      "id": "aviorstudio/tetris",
+      "version": "0.1.0",
+      "tag": "tetris-v0.1.0",
+      "sha256": "33eb430858972d7336013a8848ad42fc9748d67089d234fcf579f7dcf72c1384",
+      "bytes": 36061,
+      "width": 32,
+      "height": 40,
+      "release_ci": 41228413496,
+      "attestation_verified": true,
+      "marketplace_verified": true
+    }
+  ]
+}
diff --git a/internal/starter/packs/asteroid.tcade b/internal/starter/packs/asteroid.tcade
index 047b5ae..f930e4f 100644
Binary files a/internal/starter/packs/asteroid.tcade and b/internal/starter/packs/asteroid.tcade differ
diff --git a/internal/starter/packs/brickough.tcade b/internal/starter/packs/brickough.tcade
index 4b92b47..874be23 100644
Binary files a/internal/starter/packs/brickough.tcade and b/internal/starter/packs/brickough.tcade differ
diff --git a/internal/starter/packs/tetris.tcade b/internal/starter/packs/tetris.tcade
index 113fab5..73a0775 100644
Binary files a/internal/starter/packs/tetris.tcade and b/internal/starter/packs/tetris.tcade differ
diff --git a/scripts/build-native.py b/scripts/build-native.py
index 0601348..74bcc11 100644
--- a/scripts/build-native.py
+++ b/scripts/build-native.py
@@ -18,3 +18,6 @@
     assert system in ('Linux','Darwin','Windows') and arch in ('x86_64','arm64')
     env=dict(os.environ,RELEASE_PLATFORM=system,RELEASE_ARCH=arch,RELEASE_EXTENSION='zip' if system=='Windows' else 'tar.gz')
     subprocess.run(['python3','scripts/package-cli.py'],env=env,check=True)
+
+# Carry the notice for seed data embedded by the Rust starter games.
+shutil.copyfile("THIRD_PARTY_NOTICES.txt", "dist/THIRD_PARTY_NOTICES.txt")
diff --git a/scripts/check_archives.py b/scripts/check_archives.py
index 58d61dd..7c5706c 100644
--- a/scripts/check_archives.py
+++ b/scripts/check_archives.py
@@ -41,7 +41,9 @@ def main():
     if not os.environ.get('NATIVE_CLI_ARCHIVES'):expected={host_archive().name}
     actual={p.name for p in Path('dist').iterdir()if p.name.endswith(('.tar.gz','.zip'))}
     assert actual==expected,'incomplete or unexpected native archives'
-    sums=''.join(hashlib.sha256((Path('dist')/name).read_bytes()).hexdigest()+'  '+name+'\n'for name in sorted(expected))
+    notice=Path('dist/THIRD_PARTY_NOTICES.txt')
+    assert notice.read_bytes()==Path('THIRD_PARTY_NOTICES.txt').read_bytes(),'starter notices changed'
+    sums=''.join(hashlib.sha256((Path('dist')/name).read_bytes()).hexdigest()+'  '+name+'\n'for name in sorted(expected|{'THIRD_PARTY_NOTICES.txt'}))
     receipt=Path('dist/checksums.txt')
     if args.record:receipt.write_text(sums);return
     assert receipt.read_text()==sums,'release archive bytes changed'
diff --git a/sdk/Cargo.toml b/sdk/Cargo.toml
index 0638bd9..50fe965 100644
--- a/sdk/Cargo.toml
+++ b/sdk/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "termcade-sdk"
-version = "0.1.0"
+version = "0.1.1"
 edition = "2024"
 rust-version = "1.94"
 publish = false
diff --git a/sdk/src/canvas.rs b/sdk/src/canvas.rs
index 595ac37..86b2843 100644
--- a/sdk/src/canvas.rs
+++ b/sdk/src/canvas.rs
@@ -26,7 +26,10 @@ impl Canvas {
             "canvas needs a positive width and positive even height"
         );
         assert!(
-            shape.cols > 0 && shape.rows > 0 && shape.cols * shape.rows <= 9,
+            shape.cols > 0
+                && shape.rows > 0
+                && (shape.cols.checked_mul(shape.rows).is_some_and(|n| n <= 9)
+                    || shape.glyphs.is_empty()),
             "invalid cell subdivision"
         );
         let fw = w.checked_mul(shape.cols).expect("canvas width overflow");
@@ -179,6 +182,10 @@ impl Canvas {
         }
     }
     pub fn cell(&self, x: usize, y: usize) -> Cell {
+        assert!(
+            !self.shape.glyphs.is_empty() && self.shape.cols * self.shape.rows <= 9,
+            "glyph rendering needs a terminal cell shape"
+        );
         let mut buffer = [Color(0); 9];
         let mut n = 0;
         for row in 0..self.shape.rows {
diff --git a/sdk/src/tcgame.rs b/sdk/src/tcgame.rs
index 4e64e22..f370653 100644
--- a/sdk/src/tcgame.rs
+++ b/sdk/src/tcgame.rs
@@ -22,7 +22,7 @@ mod reactor {
         ((u64::from(high) << 32) | u64::from(low)) as i64
     }
     pub fn initialize(cols: i32, rows: i32, game: Box<dyn Game>) -> i64 {
-        if !(1..=3).contains(&cols) || !(1..=3).contains(&rows) {
+        if !(1..=32).contains(&cols) || !(1..=32).contains(&rows) {
             return 0;
         }
         let info = game.info();
diff --git a/sdk/tests/browser_framebuffer.rs b/sdk/tests/browser_framebuffer.rs
new file mode 100644
index 0000000..0e5ebda
--- /dev/null
+++ b/sdk/tests/browser_framebuffer.rs
@@ -0,0 +1,22 @@
+use termcade_sdk::{BLACK, Canvas, CellShape, RED};
+#[test]
+fn browser_framebuffers_keep_logical_coordinates_above_terminal_density() {
+    for scale in [4, 8, 16, 32] {
+        let mut canvas = Canvas::new(16, 8, BLACK, CellShape::host(scale, scale));
+        assert_eq!(canvas.pixel_size(), (16 * scale, 8 * scale / 2));
+        canvas.fill_rect_f(1., 1., 2., 3., RED);
+        assert_eq!(canvas.at_pixel(scale as i64, (scale / 2) as i64), RED);
+        assert_eq!(
+            canvas.at_pixel((3 * scale - 1) as i64, (4 * scale / 2 - 1) as i64),
+            RED
+        );
+        assert_eq!(
+            canvas.at_pixel((scale - 1) as i64, (scale / 2) as i64),
+            BLACK
+        );
+        assert_eq!(
+            canvas.at_pixel((3 * scale) as i64, (scale / 2) as i64),
+            BLACK
+        );
+    }
+}