diff --git a/makefile b/makefile
index 4608ffa..eea3411 100644
--- a/makefile
+++ b/makefile
@@ -22,3 +22,14 @@ test: check
 .PHONY: format
 format: init
 	@pnpm format
+
+# This command assumes that a `sync` will result in two pushes:
+# 1) pushing the code
+# 2) pushing the tags
+# As a result, the first code push should kick off a workflow run before the
+# `gh run watch` command is issued. However, there is some risk that this
+# sequence could run too quickly before the workflow run is available.
+.PHONY: sync
+sync:
+	@git-town sync
+	@gh run watch
diff --git a/src/experiments/todo/implementations/html-and-expressjs/app.js b/src/experiments/todo/implementations/html-and-expressjs/app.js
index 815db5f..55c9cf9 100644
--- a/src/experiments/todo/implementations/html-and-expressjs/app.js
+++ b/src/experiments/todo/implementations/html-and-expressjs/app.js
@@ -8,6 +8,7 @@ var session = require('express-session')
 var indexRouter = require('./routes/index')
 var createTodoRouter = require('./routes/createTodo')
 var toggleCompletedRouter = require('./routes/toggleCompleted')
+var saveAllRouter = require('./routes/saveAll')
 
 var app = express()
 
@@ -38,6 +39,7 @@ app.use(express.static(path.join(__dirname, 'public')))
 app.use('/', indexRouter)
 app.use('/todos/create', createTodoRouter)
 app.use('/todos/toggle-completed', toggleCompletedRouter)
+app.use('/todos/save-all', saveAllRouter)
 
 // catch 404 and forward to error handler
 app.use(function (req, res, next) {
diff --git a/src/experiments/todo/implementations/html-and-expressjs/routes/index.js b/src/experiments/todo/implementations/html-and-expressjs/routes/index.js
index 6382b5e..4693916 100644
--- a/src/experiments/todo/implementations/html-and-expressjs/routes/index.js
+++ b/src/experiments/todo/implementations/html-and-expressjs/routes/index.js
@@ -1,19 +1,26 @@
-var express = require('express')
-var router = express.Router()
+const express = require('express')
 
-const TODO_STATUS = {
-    none: 'none',
-    completed: 'completed',
-}
+const { TODO_STATUS } = require('./todos')
+
+const router = express.Router()
+
+const createViewModel = (serverTodos, errorMessage) => {
+    const areAllCompleted =
+        serverTodos.filter((todo) => todo.status != TODO_STATUS.completed)
+            .length == 0
 
-const mapServerTodosToClient = (serverTodos) => {
-    return serverTodos.map((serverTodo) => {
-        return {
-            id: serverTodo.id,
-            text: serverTodo.text,
-            isCompleted: serverTodo.status == TODO_STATUS.completed,
-        }
-    })
+    return {
+        title: 'Web 1.0: Our Todos',
+        areAllCompleted,
+        todos: serverTodos.map((serverTodo) => {
+            return {
+                id: serverTodo.id,
+                text: serverTodo.text,
+                isCompleted: serverTodo.status == TODO_STATUS.completed,
+            }
+        }),
+        error: errorMessage || null,
+    }
 }
 
 /* GET home page. */
@@ -22,11 +29,9 @@ router.get('/', function (req, res, next) {
         req.session.todos = []
     }
 
-    res.render('index', {
-        title: 'Our Todos',
-        todos: mapServerTodosToClient(req.session.todos),
-        error: req.query.e || null,
-    })
+    const viewModel = createViewModel(req.session.todos, req.query.e)
+
+    res.render('index', viewModel)
 })
 
 module.exports = router
diff --git a/src/experiments/todo/implementations/html-and-expressjs/routes/saveAll.js b/src/experiments/todo/implementations/html-and-expressjs/routes/saveAll.js
new file mode 100644
index 0000000..caeab5d
--- /dev/null
+++ b/src/experiments/todo/implementations/html-and-expressjs/routes/saveAll.js
@@ -0,0 +1,53 @@
+const express = require('express')
+
+const { TODO_STATUS } = require('./todos')
+
+const router = express.Router()
+
+router.post('/', function (req, res, next) {
+    if (!req.session.todos) {
+        req.session.todos = []
+    }
+
+    const originalTodos = req.session.todos
+
+    // start with every todo marked as "none"
+    const updatedTodos = originalTodos.map((todo) => {
+        todo.status = TODO_STATUS.none
+        return todo
+    })
+
+    const completedTodoIds = req.body['completed-todo-id']
+        ? Array.isArray(req.body['completed-todo-id'])
+            ? req.body['completed-todo-id']
+            : [req.body['completed-todo-id']]
+        : []
+
+    for (const completedTodoId of completedTodoIds) {
+        const todosRequiringCompletion = updatedTodos.filter(
+            (todo) => todo.id == completedTodoId
+        )
+
+        if (todosRequiringCompletion.length > 1) {
+            res.status(403)
+            res.send(
+                `Unexpected duplicate todos discovered with id: ${completedTodoId}`
+            )
+            return
+        }
+
+        if (todosRequiringCompletion.length === 0) {
+            res.status(403)
+            res.send(`Unexpected todo id: ${completedTodoId}`)
+            return
+        }
+
+        todosRequiringCompletion[0].status = TODO_STATUS.completed
+    }
+
+    req.session.todos = updatedTodos
+
+    res.redirect('/')
+})
+
+module.exports = router
diff --git a/src/experiments/todo/implementations/html-and-expressjs/routes/todos.js b/src/experiments/todo/implementations/html-and-expressjs/routes/todos.js
new file mode 100644
index 0000000..4da4cb7
--- /dev/null
+++ b/src/experiments/todo/implementations/html-and-expressjs/routes/todos.js
@@ -0,0 +1,8 @@
+const TODO_STATUS = {
+    none: 'none',
+    completed: 'completed',
+}
+
+module.exports = {
+    TODO_STATUS,
+}
diff --git a/src/experiments/todo/implementations/html-and-expressjs/views/index.pug b/src/experiments/todo/implementations/html-and-expressjs/views/index.pug
index 9ca83ad..4a80be6 100644
--- a/src/experiments/todo/implementations/html-and-expressjs/views/index.pug
+++ b/src/experiments/todo/implementations/html-and-expressjs/views/index.pug
@@ -5,19 +5,25 @@ block content
     h1=title
     if todos.length > 0
       form(method="POST",action="/todos/toggle-completed")
-        button(type="submit",id="toggle-completed",name="toggle-completed") Toggle completed
+        if areAllCompleted
+          button(type="submit",id="toggle-completed",name="toggle-completed",aria-label="Toggle all items as complete or incomplete") ∧
+        else
+          button(type="submit",id="toggle-completed",name="toggle-completed",aria-label="Toggle all items as complete or incomplete") ∨
     form(method="POST",action="/todos/create")
       input(name="new-todo",placeholder="What needs to be done?",value="",autofocus,aria-label="New todo")
+      button(type="submit") Submit
     if error
       div(data-testid="error",class="error")= error
   main
     if todos.length > 0
-      section(data-testid="main")
-        ul
-          each todo in todos
-            li(data-id=todo.id)
-              label(for="todo-"+todo.id)
-                input(type="checkbox",id="todo-"+todo.id,name="todo-"+todo.id,checked=todo.isCompleted)
-                span #{todo.text}
+      form(method="POST",action="/todos/save-all")
+        section(data-testid="main")
+          ul
+            each todo in todos
+              li(data-id=todo.id)
+                label(for="todo-"+todo.id)
+                  input(type="checkbox",id="todo-"+todo.id,name="completed-todo-id",checked=todo.isCompleted,value=todo.id)
+                  span #{todo.text}
+          button(type="submit") Save
   if todos.length > 0
     footer(data-testid="footer") Some footer content