diff --git a/CHANGELOG.md b/CHANGELOG.md
index ab1d3dc..d1d4cb4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,16 @@ All notable changes are documented here.
 
 ## Unreleased
 
+## 0.2.1 - 2026-08-31
+
+- Fixed compact solver-step cards so their explanations no longer overflow.
+- Fixed 75% board zoom and removed unnecessary inner scrolling at fitted and
+  reduced board sizes.
+- Changed the standard digit keypad to a 3-by-3 layout with a full-width Erase
+  key, while retaining a 4-column layout for larger grids.
+- Kept board and sidebar widths stable across Play, Set, Generate, Solve and
+  Helpers, with helper controls reflowing inside the shared sidebar width.
+
 ## 0.2.0 - 2026-08-31
 
 - Added staged guided hints that reveal focus, technique, reasoning and effects
diff --git a/README.md b/README.md
index c047285..5554194 100644
--- a/README.md
+++ b/README.md
@@ -268,7 +268,7 @@ npm run release:artifact
 
 The command verifies the manifest, types, formatting, tests, production build,
 browser workflows and Toolbox contract before creating a deterministic
-`release/sudoku-tools-0.2.0.zip` with a matching SHA-256 sidecar.
+`release/sudoku-tools-0.2.1.zip` with a matching SHA-256 sidecar.
 
 ## Scope and references
 
diff --git a/SOURCE.md b/SOURCE.md
index 78807b7..5711895 100644
--- a/SOURCE.md
+++ b/SOURCE.md
@@ -1,8 +1,8 @@
 # Corresponding source
 
-The corresponding source for Sudoku Tools 0.2.0 is available at:
+The corresponding source for Sudoku Tools 0.2.1 is available at:
 
-https://git.add-ideas.de/lotobo/sudoku-tools/src/tag/v0.2.0
+https://git.add-ideas.de/lotobo/sudoku-tools/src/tag/v0.2.1
 
 The production archive is generated from that tag with the scripts and exact
 dependency lock contained in the repository. It contains source identity,
diff --git a/package-lock.json b/package-lock.json
index 4a8365a..1c8adf8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "sudoku-tools",
-  "version": "0.2.0",
+  "version": "0.2.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "sudoku-tools",
-      "version": "0.2.0",
+      "version": "0.2.1",
       "license": "GPL-3.0-or-later",
       "dependencies": {
         "@add-ideas/toolbox-contract": "0.2.3",
diff --git a/package.json b/package.json
index a46db04..56a7b7c 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "sudoku-tools",
-  "version": "0.2.0",
+  "version": "0.2.1",
   "description": "Set, play, solve and analyse Sudoku puzzles locally in the browser.",
   "license": "GPL-3.0-or-later",
   "author": "Albrecht Degering",
diff --git a/public/CHANGELOG.md b/public/CHANGELOG.md
index ab1d3dc..d1d4cb4 100644
--- a/public/CHANGELOG.md
+++ b/public/CHANGELOG.md
@@ -4,6 +4,16 @@ All notable changes are documented here.
 
 ## Unreleased
 
+## 0.2.1 - 2026-08-31
+
+- Fixed compact solver-step cards so their explanations no longer overflow.
+- Fixed 75% board zoom and removed unnecessary inner scrolling at fitted and
+  reduced board sizes.
+- Changed the standard digit keypad to a 3-by-3 layout with a full-width Erase
+  key, while retaining a 4-column layout for larger grids.
+- Kept board and sidebar widths stable across Play, Set, Generate, Solve and
+  Helpers, with helper controls reflowing inside the shared sidebar width.
+
 ## 0.2.0 - 2026-08-31
 
 - Added staged guided hints that reveal focus, technique, reasoning and effects
diff --git a/public/README.md b/public/README.md
index c047285..5554194 100644
--- a/public/README.md
+++ b/public/README.md
@@ -268,7 +268,7 @@ npm run release:artifact
 
 The command verifies the manifest, types, formatting, tests, production build,
 browser workflows and Toolbox contract before creating a deterministic
-`release/sudoku-tools-0.2.0.zip` with a matching SHA-256 sidecar.
+`release/sudoku-tools-0.2.1.zip` with a matching SHA-256 sidecar.
 
 ## Scope and references
 
diff --git a/public/SOURCE.md b/public/SOURCE.md
index 78807b7..5711895 100644
--- a/public/SOURCE.md
+++ b/public/SOURCE.md
@@ -1,8 +1,8 @@
 # Corresponding source
 
-The corresponding source for Sudoku Tools 0.2.0 is available at:
+The corresponding source for Sudoku Tools 0.2.1 is available at:
 
-https://git.add-ideas.de/lotobo/sudoku-tools/src/tag/v0.2.0
+https://git.add-ideas.de/lotobo/sudoku-tools/src/tag/v0.2.1
 
 The production archive is generated from that tag with the scripts and exact
 dependency lock contained in the repository. It contains source identity,
diff --git a/public/toolbox-app.json b/public/toolbox-app.json
index 754ea75..d0c59bc 100644
--- a/public/toolbox-app.json
+++ b/public/toolbox-app.json
@@ -3,7 +3,7 @@
   "schemaVersion": 1,
   "id": "de.add-ideas.sudoku-tools",
   "name": "Sudoku Tools",
-  "version": "0.2.0",
+  "version": "0.2.1",
   "description": "Set, play, solve and analyse Sudoku puzzles locally in the browser.",
   "entry": "./",
   "icon": "./favicon.svg",
diff --git a/src/components/BoardViewport.tsx b/src/components/BoardViewport.tsx
index a5834bd..fe496dc 100644
--- a/src/components/BoardViewport.tsx
+++ b/src/components/BoardViewport.tsx
@@ -100,7 +100,7 @@ export function BoardViewport({
 
   return (
     <section
-      className={`board-viewport${panMode ? " is-pan-mode" : ""}`}
+      className={`board-viewport${scale > 1 ? " is-zoomed-in" : ""}${panMode ? " is-pan-mode" : ""}`}
       aria-label="Board zoom and pan"
       onKeyDownCapture={onKeyDownCapture}
     >
diff --git a/src/components/Workbench.tsx b/src/components/Workbench.tsx
index 32f9c59..c646834 100644
--- a/src/components/Workbench.tsx
+++ b/src/components/Workbench.tsx
@@ -2335,9 +2335,7 @@ export function Workbench() {
         </p>
       )}
 
-      <div
-        className={`workbench-grid${workspace === "helpers" ? " workbench-grid--helpers" : ""}`}
-      >
+      <div className="workbench-grid">
         <section className="board-column" aria-label="Puzzle board">
           <div className="board-toolbar">
             <div className="toolbar-group">
diff --git a/src/styles.css b/src/styles.css
index 81614b8..27569d5 100644
--- a/src/styles.css
+++ b/src/styles.css
@@ -632,10 +632,6 @@ body:has(.toolbox-shell[data-toolbox-theme="dark"]) .fatal-error {
   gap: clamp(0.85rem, 1.6vw, 1.35rem);
 }
 
-.workbench-grid--helpers {
-  grid-template-columns: minmax(24rem, 0.92fr) minmax(31rem, 1.08fr);
-}
-
 .board-column,
 .side-panel,
 .play-panel,
@@ -738,19 +734,23 @@ body:has(.toolbox-shell[data-toolbox-theme="dark"]) .fatal-error {
 
 .board-viewport__scroller {
   width: 100%;
-  max-height: min(82dvh, 56rem);
+  max-height: none;
   overflow: auto;
   overscroll-behavior: contain;
   scrollbar-gutter: stable;
 }
 
+.board-viewport.is-zoomed-in .board-viewport__scroller {
+  max-height: min(82dvh, 56rem);
+}
+
 .board-viewport__scroller:focus-visible {
   outline: 2px solid var(--toolbox-focus);
   outline-offset: 2px;
 }
 
 .board-viewport__canvas {
-  min-width: 100%;
+  min-width: 0;
   margin-inline: auto;
 }
 
@@ -2858,12 +2858,12 @@ body:has(.toolbox-shell[data-toolbox-theme="dark"]) .fatal-error {
 
 .digit-pad {
   display: grid;
-  grid-template-columns: repeat(auto-fit, minmax(2.75rem, 1fr));
+  grid-template-columns: repeat(3, minmax(0, 1fr));
   gap: 0.42rem;
 }
 
 .digit-pad--wide {
-  grid-template-columns: repeat(auto-fit, minmax(2.5rem, 1fr));
+  grid-template-columns: repeat(4, minmax(0, 1fr));
 }
 
 .digit-pad button {
@@ -2875,6 +2875,7 @@ body:has(.toolbox-shell[data-toolbox-theme="dark"]) .fatal-error {
 }
 
 .digit-pad .erase-key {
+  grid-column: 1 / -1;
   padding-inline: 0.65rem;
   color: var(--toolbox-muted);
   font-size: 0.76rem;
@@ -3273,7 +3274,7 @@ body:has(.toolbox-shell[data-toolbox-theme="dark"]) .fatal-error {
 
 .candidate-lab__controls {
   display: grid;
-  grid-template-columns: minmax(12rem, 1.5fr) repeat(3, minmax(8rem, 1fr));
+  grid-template-columns: repeat(2, minmax(0, 1fr));
   align-items: end;
   gap: 0.55rem 0.8rem;
 }
@@ -3510,6 +3511,8 @@ body:has(.toolbox-shell[data-toolbox-theme="dark"]) .fatal-error {
 .solve-steps {
   max-height: 32rem;
   display: grid;
+  grid-auto-rows: max-content;
+  align-content: start;
   gap: 0.42rem;
   overflow: auto;
   padding: 0.15rem;
@@ -3518,7 +3521,6 @@ body:has(.toolbox-shell[data-toolbox-theme="dark"]) .fatal-error {
 
 .solve-step {
   width: 100%;
-  min-height: 0 !important;
   display: grid !important;
   grid-template-columns: 2rem minmax(0, 1fr);
   align-items: start !important;
@@ -3966,8 +3968,7 @@ body:has(.toolbox-shell[data-toolbox-theme="dark"]) .fatal-error {
 /* Responsive composition */
 
 @media (max-width: 67rem) {
-  .workbench-grid,
-  .workbench-grid--helpers {
+  .workbench-grid {
     grid-template-columns: minmax(0, 1fr);
   }
 
@@ -4033,7 +4034,7 @@ body:has(.toolbox-shell[data-toolbox-theme="dark"]) .fatal-error {
     min-height: 2.75rem;
   }
 
-  .board-viewport__scroller {
+  .board-viewport.is-zoomed-in .board-viewport__scroller {
     max-height: min(72dvh, 48rem);
   }
 
diff --git a/src/toolbox/manifest.source.json b/src/toolbox/manifest.source.json
index 754ea75..d0c59bc 100644
--- a/src/toolbox/manifest.source.json
+++ b/src/toolbox/manifest.source.json
@@ -3,7 +3,7 @@
   "schemaVersion": 1,
   "id": "de.add-ideas.sudoku-tools",
   "name": "Sudoku Tools",
-  "version": "0.2.0",
+  "version": "0.2.1",
   "description": "Set, play, solve and analyse Sudoku puzzles locally in the browser.",
   "entry": "./",
   "icon": "./favicon.svg",
diff --git a/src/version.ts b/src/version.ts
index da2384c..2f65050 100644
--- a/src/version.ts
+++ b/src/version.ts
@@ -1 +1 @@
-export const APPLICATION_VERSION = "0.2.0";
+export const APPLICATION_VERSION = "0.2.1";
diff --git a/tests/browser/workbench.spec.ts b/tests/browser/workbench.spec.ts
index fa1c933..4f26410 100644
--- a/tests/browser/workbench.spec.ts
+++ b/tests/browser/workbench.spec.ts
@@ -65,6 +65,95 @@ test("loads standalone and keeps the core play workflow local", async ({
   expect(runtimeErrors).toEqual([]);
 });
 
+test("keeps the board, keypad and solver controls within their layouts", async ({
+  page,
+}) => {
+  await page.setViewportSize({ width: 1440, height: 1000 });
+  await page.goto("/deep/nested/sudoku/");
+
+  const frame = page.locator(".sudoku-board-frame");
+  const sidebar = page.locator(".side-panel");
+  const boardColumn = page.locator(".board-column");
+  const scroller = page.locator(".board-viewport__scroller");
+  await expect(frame).toBeVisible();
+
+  const fittedWidth = (await frame.boundingBox())?.width ?? 0;
+  expect(fittedWidth).toBeGreaterThan(0);
+  expect(
+    await scroller.evaluate(
+      (element) => element.scrollHeight <= element.clientHeight + 1,
+    ),
+  ).toBe(true);
+
+  const digits = page.getByRole("group", { name: "Digits" });
+  const digitBoxes = await Promise.all(
+    ["1", "2", "3", "4", "7", "9"].map(async (digit) =>
+      digits.getByRole("button", { name: digit, exact: true }).boundingBox(),
+    ),
+  );
+  const [one, two, three, four, seven, nine] = digitBoxes;
+  const erase = await digits
+    .getByRole("button", { name: "Erase" })
+    .boundingBox();
+  for (const box of [...digitBoxes, erase]) expect(box).not.toBeNull();
+  expect(Math.abs(one!.y - two!.y)).toBeLessThan(1);
+  expect(Math.abs(two!.y - three!.y)).toBeLessThan(1);
+  expect(Math.abs(one!.x - four!.x)).toBeLessThan(1);
+  expect(Math.abs(four!.x - seven!.x)).toBeLessThan(1);
+  expect(four!.y).toBeGreaterThan(one!.y + one!.height);
+  expect(seven!.y).toBeGreaterThan(four!.y + four!.height);
+  expect(Math.abs(erase!.x - one!.x)).toBeLessThan(1);
+  expect(
+    Math.abs(erase!.x + erase!.width - (three!.x + three!.width)),
+  ).toBeLessThan(1);
+  expect(erase!.y).toBeGreaterThan(nine!.y + nine!.height);
+
+  await page.getByRole("button", { name: "Zoom board out" }).click();
+  await expect(page.getByLabel("Board zoom level")).toHaveText("75%");
+  const reducedWidth = (await frame.boundingBox())?.width ?? 0;
+  expect(reducedWidth / fittedWidth).toBeCloseTo(0.75, 2);
+  await page.getByRole("button", { name: "Fit board" }).click();
+
+  const baselineSidebarWidth = (await sidebar.boundingBox())?.width ?? 0;
+  const baselineBoardWidth = (await boardColumn.boundingBox())?.width ?? 0;
+  for (const workspace of ["Set", "Generate", "Solve", "Helpers"]) {
+    await page.getByRole("button", { name: workspace, exact: true }).click();
+    expect((await sidebar.boundingBox())?.width ?? 0).toBeCloseTo(
+      baselineSidebarWidth,
+      1,
+    );
+    expect((await boardColumn.boundingBox())?.width ?? 0).toBeCloseTo(
+      baselineBoardWidth,
+      1,
+    );
+  }
+
+  await page.getByRole("tab", { name: "Candidate links" }).click();
+  await expect(
+    page.getByRole("heading", { name: "Links and houses" }),
+  ).toBeVisible();
+  expect(
+    await sidebar.evaluate(
+      (element) => element.scrollWidth <= element.clientWidth + 1,
+    ),
+  ).toBe(true);
+
+  await page.getByRole("button", { name: "Solve", exact: true }).click();
+  await page.getByRole("button", { name: "Build logical solve path" }).click();
+  const solveSteps = page.locator(".solve-step");
+  await expect(solveSteps.first()).toBeVisible({ timeout: 60_000 });
+  expect(await solveSteps.count()).toBeGreaterThan(0);
+  expect(
+    await solveSteps.evaluateAll((steps) =>
+      steps.every(
+        (step) =>
+          step.scrollHeight <= step.clientHeight + 1 &&
+          step.scrollWidth <= step.clientWidth + 1,
+      ),
+    ),
+  ).toBe(true);
+});
+
 test("replaces setter cages and generates a rated variant", async ({
   page,
 }) => {
diff --git a/tests/components/boardViewport.test.tsx b/tests/components/boardViewport.test.tsx
index 864a785..333b780 100644
--- a/tests/components/boardViewport.test.tsx
+++ b/tests/components/boardViewport.test.tsx
@@ -9,19 +9,35 @@ describe("BoardViewport", () => {
 
   it("zooms, fits and restores the persisted scale", async () => {
     const user = userEvent.setup();
-    const { unmount } = render(
+    const { container, unmount } = render(
       <BoardViewport>
         <div>Board</div>
       </BoardViewport>,
     );
 
     expect(screen.getByLabelText("Board zoom level")).toHaveTextContent("100%");
+    expect(container.querySelector(".board-viewport")).not.toHaveClass(
+      "is-zoomed-in",
+    );
+    await user.click(screen.getByRole("button", { name: "Zoom board out" }));
+    expect(screen.getByLabelText("Board zoom level")).toHaveTextContent("75%");
+    expect(container.querySelector(".board-viewport__canvas")).toHaveStyle({
+      width: "75%",
+      maxWidth: "36rem",
+    });
+    expect(container.querySelector(".board-viewport")).not.toHaveClass(
+      "is-zoomed-in",
+    );
+    await user.click(screen.getByRole("button", { name: "Zoom board in" }));
     await user.click(screen.getByRole("button", { name: "Zoom board in" }));
     expect(screen.getByLabelText("Board zoom level")).toHaveTextContent("125%");
+    expect(container.querySelector(".board-viewport")).toHaveClass(
+      "is-zoomed-in",
+    );
     expect(localStorage.getItem(BOARD_SCALE_STORAGE_KEY)).toBe("1.25");
     unmount();
 
-    render(
+    const restored = render(
       <BoardViewport>
         <div>Board</div>
       </BoardViewport>,
@@ -29,6 +45,9 @@ describe("BoardViewport", () => {
     expect(screen.getByLabelText("Board zoom level")).toHaveTextContent("125%");
     await user.click(screen.getByRole("button", { name: "Fit board" }));
     expect(screen.getByLabelText("Board zoom level")).toHaveTextContent("100%");
+    expect(restored.container.querySelector(".board-viewport")).not.toHaveClass(
+      "is-zoomed-in",
+    );
   });
 
   it("offers explicit pan mode and board-scoped zoom shortcuts", async () => {
diff --git a/tests/components/numberPad.test.tsx b/tests/components/numberPad.test.tsx
index 272cdb4..0e3c373 100644
--- a/tests/components/numberPad.test.tsx
+++ b/tests/components/numberPad.test.tsx
@@ -3,7 +3,42 @@ import userEvent from "@testing-library/user-event";
 import { describe, expect, it, vi } from "vitest";
 import { NumberPad } from "../../src/components/NumberPad";
 
-describe("NumberPad colour accessibility", () => {
+describe("NumberPad", () => {
+  it("marks standard and large digit layouts and exposes a full-row erase key", () => {
+    const { container, rerender } = render(
+      <NumberPad
+        size={9}
+        mode="value"
+        onMode={vi.fn()}
+        onValue={vi.fn()}
+        onErase={vi.fn()}
+      />,
+    );
+
+    expect(screen.getByRole("group", { name: "Digits" })).toHaveClass(
+      "digit-pad",
+    );
+    expect(container.querySelector(".digit-pad")).not.toHaveClass(
+      "digit-pad--wide",
+    );
+    expect(screen.getByRole("button", { name: "Erase" })).toHaveClass(
+      "erase-key",
+    );
+
+    rerender(
+      <NumberPad
+        size={16}
+        mode="value"
+        onMode={vi.fn()}
+        onValue={vi.fn()}
+        onErase={vi.fn()}
+      />,
+    );
+    expect(container.querySelector(".digit-pad")).toHaveClass(
+      "digit-pad--wide",
+    );
+  });
+
   it("names each colour by both hue and pattern", async () => {
     const user = userEvent.setup();
     const onValue = vi.fn();