diff --git a/src/App.js b/src/App.js
index f5afa39..9e93684 100644
--- a/src/App.js
+++ b/src/App.js
@@ -8,25 +8,29 @@ import Game from "./routes/Game";
 import About from "./routes/About";
 import FAQ from "./routes/FAQ";
 
+import { AuthProvider } from "./contexts/AuthContext";
+
 function App() {
   return (
     <ThemeProvider theme={theme}>
-      <Router>
-        <Switch>
-          <Route path="/about">
-            <About />
-          </Route>
-          <Route path="/faq">
-            <FAQ />
-          </Route>
-          <Route path="/game/:id">
-            <Game />
-          </Route>
-          <Route path="/">
-            <Home />
-          </Route>
-        </Switch>
-      </Router>
+      <AuthProvider>
+        <Router>
+          <Switch>
+            <Route path="/about">
+              <About />
+            </Route>
+            <Route path="/faq">
+              <FAQ />
+            </Route>
+            <Route path="/game/:id">
+              <Game />
+            </Route>
+            <Route path="/">
+              <Home />
+            </Route>
+          </Switch>
+        </Router>
+      </AuthProvider>
     </ThemeProvider>
   );
 }
diff --git a/src/components/Modal.js b/src/components/Modal.js
index 1b9bd00..94b9eda 100644
--- a/src/components/Modal.js
+++ b/src/components/Modal.js
@@ -2,7 +2,13 @@ import React from "react";
 import Modal from "react-modal";
 import { useThemeUI, Close } from "theme-ui";
 
-function StyledModal({ isOpen, onRequestClose, children, ...props }) {
+function StyledModal({
+  isOpen,
+  onRequestClose,
+  children,
+  allowClose,
+  ...props
+}) {
   const { theme } = useThemeUI();
 
   return (
@@ -25,13 +31,19 @@ function StyledModal({ isOpen, onRequestClose, children, ...props }) {
       {...props}
     >
       {children}
-      <Close
-        m={0}
-        sx={{ position: "absolute", top: 0, right: 0 }}
-        onClick={onRequestClose}
-      />
+      {allowClose && (
+        <Close
+          m={0}
+          sx={{ position: "absolute", top: 0, right: 0 }}
+          onClick={onRequestClose}
+        />
+      )}
     </Modal>
   );
 }
 
+StyledModal.defaultProps = {
+  allowClose: true,
+};
+
 export default StyledModal;
diff --git a/src/contexts/AuthContext.js b/src/contexts/AuthContext.js
new file mode 100644
index 0000000..ace0b95
--- /dev/null
+++ b/src/contexts/AuthContext.js
@@ -0,0 +1,25 @@
+import React, { useState, useEffect } from "react";
+
+const AuthContext = React.createContext();
+
+export function AuthProvider({ children }) {
+  const [password, setPassword] = useState(
+    sessionStorage.getItem("auth") || ""
+  );
+
+  useEffect(() => {
+    sessionStorage.setItem("auth", password);
+  }, [password]);
+
+  const [authenticationStatus, setAuthenticationStatus] = useState("unknown");
+
+  const value = {
+    password,
+    setPassword,
+    authenticationStatus,
+    setAuthenticationStatus,
+  };
+  return <AuthContext.Provider value={value}>{children}</AuthContext.Provider>;
+}
+
+export default AuthContext;
diff --git a/src/helpers/useSession.js b/src/helpers/useSession.js
index caf67cf..0def7a4 100644
--- a/src/helpers/useSession.js
+++ b/src/helpers/useSession.js
@@ -1,9 +1,11 @@
-import { useEffect, useState } from "react";
+import { useEffect, useState, useContext } from "react";
 import io from "socket.io-client";
 
 import { omit } from "../helpers/shared";
 import Peer from "../helpers/Peer";
 
+import AuthContext from "../contexts/AuthContext";
+
 const socket = io("https://broker.owlbear.rodeo");
 
 function useSession(
@@ -15,9 +17,11 @@ function useSession(
   onPeerTrackRemoved,
   onPeerError
 ) {
+  const { password, setAuthenticationStatus } = useContext(AuthContext);
+
   useEffect(() => {
-    socket.emit("join party", partyId);
-  }, [partyId]);
+    socket.emit("join party", partyId, password);
+  }, [partyId, password]);
 
   const [peers, setPeers] = useState({});
 
@@ -148,6 +152,7 @@ function useSession(
         const sync = index === 0;
         addPeer(id, true, sync);
       }
+      setAuthenticationStatus("authenticated");
     }
 
     function handleSignal(data) {
@@ -157,17 +162,23 @@ function useSession(
       }
     }
 
+    function handleAuthError() {
+      setAuthenticationStatus("unauthenticated");
+    }
+
     socket.on("party member joined", handlePartyMemberJoined);
     socket.on("party member left", handlePartyMemberLeft);
     socket.on("joined party", handleJoinedParty);
     socket.on("signal", handleSignal);
+    socket.on("auth error", handleAuthError);
     return () => {
       socket.removeListener("party member joined", handlePartyMemberJoined);
       socket.removeListener("party member left", handlePartyMemberLeft);
       socket.removeListener("joined party", handleJoinedParty);
       socket.removeListener("signal", handleSignal);
+      socket.removeListener("auth error", handleAuthError);
     };
-  }, [peers]);
+  }, [peers, setAuthenticationStatus]);
 
   return { peers, socket };
 }
diff --git a/src/modals/AuthModal.js b/src/modals/AuthModal.js
new file mode 100644
index 0000000..e97b0a8
--- /dev/null
+++ b/src/modals/AuthModal.js
@@ -0,0 +1,52 @@
+import React, { useState, useContext, useRef } from "react";
+import { Box, Input, Button, Label, Flex } from "theme-ui";
+
+import AuthContext from "../contexts/AuthContext";
+
+import Modal from "../components/Modal";
+
+function AuthModal({ isOpen }) {
+  const { password, setPassword, setAuthenticationStatus } = useContext(
+    AuthContext
+  );
+  const [tmpPassword, setTempPassword] = useState(password);
+
+  function handleChange(event) {
+    setTempPassword(event.target.value);
+  }
+
+  function handleSubmit(event) {
+    event.preventDefault();
+    setAuthenticationStatus("unknown");
+    setPassword(tmpPassword);
+  }
+
+  const inputRef = useRef();
+  function focusInput() {
+    inputRef.current && inputRef.current.focus();
+  }
+
+  return (
+    <Modal isOpen={isOpen} allowClose={false} onAfterOpen={focusInput}>
+      <Box as="form" onSubmit={handleSubmit}>
+        <Label py={2} htmlFor="password">
+          Enter password
+        </Label>
+        <Input
+          id="password"
+          value={tmpPassword}
+          onChange={handleChange}
+          ref={inputRef}
+          autoComplete="off"
+        />
+        <Flex py={2}>
+          <Button sx={{ flexGrow: 1 }} disabled={!tmpPassword}>
+            Join
+          </Button>
+        </Flex>
+      </Box>
+    </Modal>
+  );
+}
+
+export default AuthModal;
diff --git a/src/modals/JoinModal.js b/src/modals/JoinModal.js
index c28d655..32d677b 100644
--- a/src/modals/JoinModal.js
+++ b/src/modals/JoinModal.js
@@ -48,7 +48,11 @@ function JoinModal({ isOpen, onRequestClose }) {
             onChange={handleChange}
             ref={inputRef}
           />
-          <Button disabled={!gameId}>Join › (ﾉ◕ヮ◕)ﾉ*:･ﾟ✧</Button>
+          <Flex>
+            <Button sx={{ flexGrow: 1 }} disabled={!gameId}>
+              Join › (ﾉ◕ヮ◕)ﾉ*:･ﾟ✧
+            </Button>
+          </Flex>
         </Box>
       </Flex>
     </Modal>
diff --git a/src/modals/StartModal.js b/src/modals/StartModal.js
new file mode 100644
index 0000000..91d274c
--- /dev/null
+++ b/src/modals/StartModal.js
@@ -0,0 +1,73 @@
+import React, { useState, useContext } from "react";
+import { Box, Label, Input, Button, Flex, Checkbox } from "theme-ui";
+import { useHistory } from "react-router-dom";
+import shortid from "shortid";
+
+import AuthContext from "../contexts/AuthContext";
+
+import Modal from "../components/Modal";
+
+function StartModal({ isOpen, onRequestClose }) {
+  let history = useHistory();
+  const { password, setPassword } = useContext(AuthContext);
+
+  function handlePasswordChange(event) {
+    setPassword(event.target.value);
+  }
+
+  const [usePassword, setUsePassword] = useState(true);
+  function handleUsePasswordChange(event) {
+    setUsePassword(event.target.checked);
+  }
+
+  function handleSubmit(event) {
+    event.preventDefault();
+    if (!usePassword) {
+      setPassword("");
+    }
+    history.push(`/game/${shortid.generate()}`);
+  }
+
+  return (
+    <Modal isOpen={isOpen} onRequestClose={onRequestClose}>
+      <Flex
+        sx={{
+          flexDirection: "column",
+          justifyContent: "center",
+          maxWidth: "300px",
+          flexGrow: 1,
+        }}
+        m={2}
+      >
+        <Box as="form" onSubmit={handleSubmit}>
+          <Label htmlFor="password">Password</Label>
+          <Input
+            my={1}
+            id="password"
+            name="password"
+            value={usePassword ? password : ""}
+            onChange={handlePasswordChange}
+            disabled={!usePassword}
+            autoComplete="off"
+          />
+          <Box>
+            <Label mb={3}>
+              <Checkbox
+                checked={usePassword}
+                onChange={handleUsePasswordChange}
+              />
+              Use password
+            </Label>
+          </Box>
+          <Flex>
+            <Button sx={{ flexGrow: 1 }} disabled={!password && usePassword}>
+              Start
+            </Button>
+          </Flex>
+        </Box>
+      </Flex>
+    </Modal>
+  );
+}
+
+export default StartModal;
diff --git a/src/routes/Game.js b/src/routes/Game.js
index 5f125f7..7ac4d95 100644
--- a/src/routes/Game.js
+++ b/src/routes/Game.js
@@ -1,9 +1,14 @@
-import React, { useState, useRef, useEffect, useCallback } from "react";
+import React, {
+  useState,
+  useRef,
+  useEffect,
+  useCallback,
+  useContext,
+} from "react";
 import { Flex, Box, Text, Link } from "theme-ui";
 import { useParams } from "react-router-dom";
 
 import { omit, isStreamStopped } from "../helpers/shared";
-
 import useSession from "../helpers/useSession";
 import { getRandomMonster } from "../helpers/monsters";
 
@@ -12,8 +17,13 @@ import Tokens from "../components/Tokens";
 import Map from "../components/Map";
 import Banner from "../components/Banner";
 
+import AuthModal from "../modals/AuthModal";
+
+import AuthContext from "../contexts/AuthContext";
+
 function Game() {
   const { id: gameId } = useParams();
+  const { authenticationStatus } = useContext(AuthContext);
 
   const { peers, socket } = useSession(
     gameId,
@@ -238,6 +248,7 @@ function Game() {
           </Text>
         </Box>
       </Banner>
+      <AuthModal isOpen={authenticationStatus === "unauthenticated"} />
     </>
   );
 }
diff --git a/src/routes/Home.js b/src/routes/Home.js
index 7cd6158..2e9d967 100644
--- a/src/routes/Home.js
+++ b/src/routes/Home.js
@@ -1,22 +1,25 @@
-import React, { useState } from "react";
+import React, { useState, useEffect, useContext } from "react";
 import { Flex, Button, Image, Text } from "theme-ui";
-import shortid from "shortid";
-import { useHistory } from "react-router-dom";
 
 import Footer from "../components/Footer";
 
+import StartModal from "../modals/StartModal";
 import JoinModal from "../modals/JoinModal";
 
+import AuthContext from "../contexts/AuthContext";
+
 import owlington from "../images/Owlington.png";
 
 function Home() {
-  let history = useHistory();
-  function handleStartGame() {
-    history.push(`/game/${shortid.generate()}`);
-  }
-
+  const [isStartModalOpen, setIsStartModalOpen] = useState(false);
   const [isJoinModalOpen, setIsJoinModalOpen] = useState(false);
 
+  // Reset password on visiting home
+  const { setPassword } = useContext(AuthContext);
+  useEffect(() => {
+    setPassword("");
+  }, [setPassword]);
+
   return (
     <Flex
       sx={{
@@ -39,7 +42,7 @@ function Home() {
           Owlbear Rodeo
         </Text>
         <Image src={owlington} m={2} />
-        <Button m={2} onClick={handleStartGame}>
+        <Button m={2} onClick={() => setIsStartModalOpen(true)}>
           Start Game
         </Button>
         <Button m={2} onClick={() => setIsJoinModalOpen(true)}>
@@ -52,6 +55,10 @@ function Home() {
           isOpen={isJoinModalOpen}
           onRequestClose={() => setIsJoinModalOpen(false)}
         />
+        <StartModal
+          isOpen={isStartModalOpen}
+          onRequestClose={() => setIsStartModalOpen(false)}
+        />
       </Flex>
       <Footer />
     </Flex>