diff --git a/INSTRUCTIONS.md b/INSTRUCTIONS.md
new file mode 100644
index 0000000..800fd01
--- /dev/null
+++ b/INSTRUCTIONS.md
@@ -0,0 +1,37 @@
+# Block Registration
+
+All content in the WordPress block editor is a block.
+
+This is similar to other editors like [Medium](https://medium.com/), [Notion](https://www.notion.so/), and [MailChimp](https://mailchimp.com/).
+
+Blocks are usually interactive, so they have a React component to edit them.
+
+In this exercise, we're going to register a block so the editor is aware of it.
+
+The modern way to register a WordPress block is [with](https://developer.wordpress.org/block-editor/reference-guides/block-api/block-metadata/) a `block.json` file.
+
+A `block.json` file [must be present](https://github.com/WordPress/wporg-plugin-guidelines/blob/28d945f414db3bb42e04805fb109e7178cbabc9a/blocks.md#4-block-plugins-must-include-a-blockjson-file) to be eligible for the [Block Directory](https://wordpress.org/plugins/browse/block/).
+
+Also, WordPress [recommends](https://developer.wordpress.org/block-editor/reference-guides/block-api/block-metadata/#benefits-using-the-metadata-file) registering a block with PHP and JS.
+
+Both registrations will be simple because of `block.json`.
+
+## Exercise
+
+You're going to register the block in JS and PHP.
+
+Look for 🚧 in the exercise files for where to edit.
+
+In [js/src/index.exercise.js](js/src/index.exercise.js), `registerBlockType()` will look like:
+
+```js
+registerBlockType( block.name, {
+	// edit component here.
+```
+
+### Files
+- [progress-indicator.php](progress-indicator.php)
+- [js/src/index.exercise.js](js/src/index.exercise.js)
+
+### Solution
+https://user-images.githubusercontent.com/4063887/159091534-12a41901-4100-4fc5-8222-fa25413977d7.mp4
diff --git a/js/src/edit.js b/js/src/edit.js
index 2bbce03..efc53f0 100644
--- a/js/src/edit.js
+++ b/js/src/edit.js
@@ -6,63 +6,11 @@ import * as React from 'react';
 /**
  * WordPress dependencies
  */
-import { InspectorControls, useBlockProps } from '@wordpress/block-editor';
-import { ColorPalette, PanelBody, RangeControl } from '@wordpress/components';
-import { useSelect } from '@wordpress/data';
 import { __ } from '@wordpress/i18n';
 
-/**
- * Internal dependencies
- */
-import ProgressIndicator from './progress-indicator';
-
-/**
- * The component for the editor.
- *
- * @param {{
- *  attributes: import('./index').Attributes,
- *  setAttributes: Function
- * }} props
- * @return {React.ReactElement} The component.
- */
-export default function Edit( { attributes, setAttributes } ) {
-	const blockProps = useBlockProps();
-	const { colors } = useSelect(
-		( select ) => select( 'core/block-editor' ).getSettings()
-	);
-
-	return <div { ...blockProps }>
-		<ProgressIndicator attributes={ attributes } />
-		<InspectorControls>
-			<PanelBody title={ __( 'Color', 'progress-indicator' ) }>
-				<ColorPalette
-					colors={ colors }
-					value={ attributes.color }
-					onChange={ ( newValue ) =>
-						setAttributes( { color: newValue } )
-					}
-				/>
-			</PanelBody>
-			<PanelBody title={ __( 'Steps', 'progress-indicator' ) }>
-				<RangeControl
-					label={ __( 'Current Step', 'progress-indicator' ) }
-					value={ attributes.currentStep }
-					onChange={ ( newValue ) =>
-						setAttributes( { currentStep: Number( newValue ) } )
-					}
-					min={ 1 }
-					max={ attributes.numberOfSteps }
-				/>
-				<RangeControl
-					label={ __( 'Number of Steps', 'progress-indicator' ) }
-					value={ attributes.numberOfSteps }
-					onChange={ ( newValue ) =>
-						setAttributes( { numberOfSteps: Number( newValue ) } )
-					}
-					min={ 1 }
-					max={ 10 }
-				/>
-			</PanelBody>
-		</InspectorControls>
-	</div>;
+/** The component for the editor. */
+export default function Edit() {
+	return <span>
+		{ __( 'This is a placeholder for the Progress Indicator block', 'progress-indicator' ) }
+	</span>;
 }
diff --git a/js/src/index.exercise.js b/js/src/index.exercise.js
new file mode 100644
index 0000000..107976b
--- /dev/null
+++ b/js/src/index.exercise.js
@@ -0,0 +1,25 @@
+/**
+ * WordPress dependencies
+ */
+import { registerBlockType } from '@wordpress/blocks';
+
+/**
+ * Internal dependencies
+ */
+import block from '../../block.json';
+// 🚧 Import the edit component.
+// Import the save component.
+
+/**
+ * @typedef {{
+ *  color: typeof block.attributes.color.default,
+ *  currentStep: typeof block.attributes.currentStep.default,
+ *  numberOfSteps: typeof block.attributes.numberOfSteps.default
+ * }} Attributes
+ */
+
+// @ts-ignore The declaration file is wrong.
+registerBlockType( block.name, {
+	// 🚧 For property 'edit', pass the edit component imported above.
+	// For property 'save', pass the save component imported above.
+} );
diff --git a/js/src/index.final.js b/js/src/index.final.js
new file mode 100644
index 0000000..8b02e92
--- /dev/null
+++ b/js/src/index.final.js
@@ -0,0 +1,25 @@
+/**
+ * WordPress dependencies
+ */
+import { registerBlockType } from '@wordpress/blocks';
+
+/**
+ * Internal dependencies
+ */
+import block from '../../block.json';
+import edit from './edit';
+import save from './save';
+
+/**
+ * @typedef {{
+ *  color: typeof block.attributes.color.default,
+ *  currentStep: typeof block.attributes.currentStep.default,
+ *  numberOfSteps: typeof block.attributes.numberOfSteps.default
+ * }} Attributes
+ */
+
+// @ts-ignore The declaration file is wrong.
+registerBlockType( block.name, {
+	edit,
+	save,
+} );
diff --git a/js/src/index.js b/js/src/index.js
index 8b02e92..1271da2 100644
--- a/js/src/index.js
+++ b/js/src/index.js
@@ -1,25 +1,2 @@
-/**
- * WordPress dependencies
- */
-import { registerBlockType } from '@wordpress/blocks';
-
-/**
- * Internal dependencies
- */
-import block from '../../block.json';
-import edit from './edit';
-import save from './save';
-
-/**
- * @typedef {{
- *  color: typeof block.attributes.color.default,
- *  currentStep: typeof block.attributes.currentStep.default,
- *  numberOfSteps: typeof block.attributes.numberOfSteps.default
- * }} Attributes
- */
-
-// @ts-ignore The declaration file is wrong.
-registerBlockType( block.name, {
-	edit,
-	save,
-} );
+// export * from './index.final';
+export * from './index.exercise';
diff --git a/js/src/progress-indicator.js b/js/src/progress-indicator.js
index 2b373b4..9cdddc1 100644
--- a/js/src/progress-indicator.js
+++ b/js/src/progress-indicator.js
@@ -8,7 +8,6 @@ import tinycolor2 from 'tinycolor2';
  * The progress indicator component.
  *
  * @param {{attributes: import('./').Attributes}} props
- * @return {React.ReactElement} The component.
  */
 export default function ProgressIndicator( { attributes } ) {
 	const color = tinycolor2( attributes.color );
diff --git a/js/src/progress-indicator.test.js b/js/src/progress-indicator.test.js
deleted file mode 100644
index b93d704..0000000
--- a/js/src/progress-indicator.test.js
+++ /dev/null
@@ -1,44 +0,0 @@
-/**
- * External dependencies
- */
-import '@testing-library/jest-dom/extend-expect';
-import { render, screen } from '@testing-library/react';
-
-/**
- * Internal dependencies
- */
-import ProgressIndicator from './progress-indicator';
-
-test( 'ProgressIndicator with current step of 2/5', () => {
-	render(
-		<ProgressIndicator
-			attributes={ {
-				numberOfSteps: 5,
-				currentStep: 2,
-				color: '#10b981',
-			} }
-		/>
-	);
-
-	it.each( [ 2, 3, 4, 5 ], ( number ) => {
-		expect( screen.getByText( number ) ).toBeInTheDocument();
-	} );
-
-	expect( screen.getAllByRole( 'img' ).length ).toEqual( 1 );
-} );
-
-test( 'ProgressIndicator with current step of 5/5', () => {
-	render(
-		<ProgressIndicator
-			attributes={ {
-				numberOfSteps: 5,
-				currentStep: 5,
-				color: '#10b981',
-			} }
-		/>
-	);
-
-	expect( screen.queryByText( 4 ) ).not.toBeInTheDocument();
-	expect( screen.getByText( 5 ) ).toBeInTheDocument();
-	expect( screen.getAllByRole( 'img' ).length ).toEqual( 4 );
-} );
diff --git a/js/src/save.js b/js/src/save.js
index 83cb567..178ce7f 100644
--- a/js/src/save.js
+++ b/js/src/save.js
@@ -6,23 +6,15 @@ import * as React from 'react';
 /**
  * WordPress dependencies
  */
-import { useBlockProps } from '@wordpress/block-editor';
-
-/**
- * Internal dependencies
- */
-import ProgressIndicator from './progress-indicator';
+import { __ } from '@wordpress/i18n';
 
 /**
  * The component to save the markup.
  *
- * @param {{attributes: import('./').Attributes}} props
  * @return {React.ReactElement} The component.
  */
-export default function Save( { attributes } ) {
-	const blockProps = useBlockProps.save();
-
-	return <div { ...blockProps }>
-		<ProgressIndicator attributes={ attributes } />
-	</div>;
+export default function Save() {
+	return <span>
+		{ __( 'This is a placeholder for the Progress Indicator block', 'progress-indicator' ) }
+	</span>;
 }
diff --git a/phpcs.xml b/phpcs.xml
index 1250d37..21a3205 100644
--- a/phpcs.xml
+++ b/phpcs.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0"?>
-<ruleset name="WordPress Coding Standards for Progress Indicator Block">
+<ruleset name="WordPress Coding Standards for Progress Indicator">
 
 	<rule ref="WordPress-Core">
 		<exclude name="Generic.Arrays.DisallowShortArraySyntax" />
diff --git a/progress-indicator.php b/progress-indicator.php
index a3c5fe9..83192a0 100644
--- a/progress-indicator.php
+++ b/progress-indicator.php
@@ -22,9 +22,9 @@
 
 add_action( 'init', __NAMESPACE__ . '\register_block' );
 
-/**
- * Registers the block with the block.json file.
- */
-function register_block() {
-	register_block_type( __DIR__ );
-}
+// 🚧 Define a function register_block().
+// That function should simply call the PHP function to register a block: https://developer.wordpress.org/reference/functions/register_block_type/
+// And that function's only argument should be the directory of this plugin.
+// You can get that directory from a magic constant: https://www.php.net/manual/en/language.constants.magic.php
+// That's where it'll look for the block.json file.
+// Do npm run lint:php to see if there's anything else to add.