diff --git a/toys/facelight/app.js b/toys/facelight/app.js
index 46befc9..873f63e 100644
--- a/toys/facelight/app.js
+++ b/toys/facelight/app.js
@@ -1,3 +1,5 @@
+const defaultTemp = 5500
+
 function colorTemperatureToRGB(kelvin) {
 	// https://gist.github.com/paulkaplan/5184275
 	
@@ -42,7 +44,7 @@ function changeTemp(e) {
   let tempOut = document.querySelector("#tempOut")
   let temp
   if (!e) {
-    temp = localStorage.temp || 5500
+    temp = localStorage.temp || defaultTemp
   } else if (e.target) {
     temp = Number(e.target.value)
   } else {
@@ -56,8 +58,26 @@ function changeTemp(e) {
   localStorage.temp = temp
 }
 
+function keydownEvent(event) {
+  let temp = Number(localStorage.temp || defaultTemp)
+  switch (event.key) {
+    case "ArrowLeft":
+    case "ArrowDown":
+      event.preventDefault()
+      changeTemp(temp - 100)
+      break
+    case "ArrowRight":
+    case "ArrowUp":
+      event.preventDefault()
+      changeTemp(temp + 100)
+      break
+  }
+  console.log("new temp is", temp)
+}
+
 function init() {
-	document.querySelector("#temp").addEventListener("input", changeTemp)
+  document.querySelector("#temp").addEventListener("input", changeTemp)
+  document.addEventListener("keydown", keydownEvent)
   changeTemp()
   if (navigator.serviceWorker) {
     navigator.serviceWorker.register("sw.js")
diff --git a/toys/index.md b/toys/index.md
index e8169d7..400eeae 100644
--- a/toys/index.md
+++ b/toys/index.md
@@ -14,5 +14,6 @@ Maybe you'll just wonder why I spend so much time on this garbage.
 * [Grep Dict](grepdict/) runs `grep` on `/usr/share/dict/words`; perfect for cheating on crossword puzzles
 * If you need to write someone a letter but really don't want to, try my
   [social letter generator](letter.html)
+* [Pocket Mastermind PDF](mastermind.pdf) ([PostScript Source](mastermind.ps))
 * [Crunt](crunt.html)
 * [Serpeński Gasket on Tektronix Terminal](serpenski.html) which amazed 4 whole people at my high school in 1991.
diff --git a/toys/mastermind.pdf b/toys/mastermind.pdf
new file mode 100644
index 0000000..ebc6648
Binary files /dev/null and b/toys/mastermind.pdf differ
diff --git a/toys/mastermind.ps b/toys/mastermind.ps
new file mode 100644
index 0000000..d5462a0
--- /dev/null
+++ b/toys/mastermind.ps
@@ -0,0 +1,109 @@
+%!PS-Adobe-3.0
+%%Title: Pocket Mastermind
+%%Creator: Neale Pickett <neale@woozle.org>
+%%Orientation: Landscape
+%%DocumentMedia: US-Letter 612 792 80 ( ) ( )
+%%EndComments
+
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+} for