diff --git a/README.md b/README.md
index dbe3bde..1c5d401 100644
--- a/README.md
+++ b/README.md
@@ -13,9 +13,9 @@ To start off and understand the desired toggle effect, try changing `let isSelec
 
 ### Tasks
 
-- [ ] change the app to render 5 boards
-- [ ] add state to track current selection
-- [ ] add an event handler for the toggle button
+- [X] change the app to render 5 boards
+- [X] add state to track current selection
+- [X] add an event handler for the toggle button
 
 ### To submit
 
diff --git a/src/components/BoardSwitcher.jsx b/src/components/BoardSwitcher.jsx
index e99793a..e091721 100644
--- a/src/components/BoardSwitcher.jsx
+++ b/src/components/BoardSwitcher.jsx
@@ -1,4 +1,4 @@
-import React from "react";
+import React, { useState } from "react";
 
 function Board(props) {
   let className = "board";
@@ -11,15 +11,21 @@ function Board(props) {
 
 function BoardSwitcher(props) {
   let boards = [];
+  const [currentBoard, setCurrentBoard] = useState(0);
+
+  const toggle = () => {
+    setCurrentBoard((currentBoard + 1) % props.numBoards);
+  }
+
   for (let ii = 0; ii < props.numBoards; ii++) {
-    let isSelected = ii === 0;
+    let isSelected = ii === currentBoard;
     boards.push(<Board index={ii} selected={isSelected} key={ii} />);
   }
 
   return (
     <div>
       <div className="boards">{boards}</div>
-      <button>Toggle</button>
+      <button onClick={toggle}>Toggle</button>
     </div>
   );
 }
diff --git a/src/main.jsx b/src/main.jsx
index 782f402..316ad56 100644
--- a/src/main.jsx
+++ b/src/main.jsx
@@ -6,6 +6,6 @@ import "./index.css";
 const root = ReactDOM.createRoot(document.getElementById("root"));
 root.render(
   <React.StrictMode>
-    <BoardSwitcher numBoards={3} />
+    <BoardSwitcher numBoards={5} />
   </React.StrictMode>
 );