diff --git a/.idea/modules/kudens_main.iml b/.idea/modules/kudens_main.iml
index d8b2113..0cb94fb 100644
--- a/.idea/modules/kudens_main.iml
+++ b/.idea/modules/kudens_main.iml
@@ -26,7 +26,21 @@
               </K2JSCompilerArguments>
             </option>
             <option name="k2jvmCompilerArguments">
-              <K2JVMCompilerArguments />
+              <K2JVMCompilerArguments>
+                <option name="noStdlib" value="true" />
+                <option name="languageVersion" value="1.1" />
+                <option name="apiVersion" value="1.1" />
+                <option name="suppressWarnings" value="true" />
+                <option name="coroutinesWarn" value="true" />
+                <option name="freeArgs">
+                  <list>
+                    <option value="$MODULE_DIR$/../../build/kotlinjs/kudens.js" />
+                    <option value="v5" />
+                    <option value="plain" />
+                    <option value="call" />
+                  </list>
+                </option>
+              </K2JVMCompilerArguments>
             </option>
             <option name="_commonCompilerArguments">
               <DummyImpl>

diff --git a/.idea/modules/kudens_main.iml b/.idea/modules/kudens_main.iml
index d8b2113..0cb94fb 100644
--- a/.idea/modules/kudens_main.iml
+++ b/.idea/modules/kudens_main.iml
@@ -26,7 +26,21 @@
               </K2JSCompilerArguments>
             </option>
             <option name="k2jvmCompilerArguments">
-              <K2JVMCompilerArguments />
+              <K2JVMCompilerArguments>
+                <option name="noStdlib" value="true" />
+                <option name="languageVersion" value="1.1" />
+                <option name="apiVersion" value="1.1" />
+                <option name="suppressWarnings" value="true" />
+                <option name="coroutinesWarn" value="true" />
+                <option name="freeArgs">
+                  <list>
+                    <option value="$MODULE_DIR$/../../build/kotlinjs/kudens.js" />
+                    <option value="v5" />
+                    <option value="plain" />
+                    <option value="call" />
+                  </list>
+                </option>
+              </K2JVMCompilerArguments>
             </option>
             <option name="_commonCompilerArguments">
               <DummyImpl>
diff --git a/.idea/modules/kudens_test.iml b/.idea/modules/kudens_test.iml
index fdb3b82..63591a0 100644
--- a/.idea/modules/kudens_test.iml
+++ b/.idea/modules/kudens_test.iml
@@ -26,7 +26,21 @@
               </K2JSCompilerArguments>
             </option>
             <option name="k2jvmCompilerArguments">
-              <K2JVMCompilerArguments />
+              <K2JVMCompilerArguments>
+                <option name="noStdlib" value="true" />
+                <option name="languageVersion" value="1.1" />
+                <option name="apiVersion" value="1.1" />
+                <option name="suppressWarnings" value="true" />
+                <option name="coroutinesWarn" value="true" />
+                <option name="freeArgs">
+                  <list>
+                    <option value="$MODULE_DIR$/../../build/kotlinjs/kudens.js" />
+                    <option value="v5" />
+                    <option value="plain" />
+                    <option value="call" />
+                  </list>
+                </option>
+              </K2JVMCompilerArguments>
             </option>
             <option name="_commonCompilerArguments">
               <DummyImpl>

diff --git a/.idea/modules/kudens_main.iml b/.idea/modules/kudens_main.iml
index d8b2113..0cb94fb 100644
--- a/.idea/modules/kudens_main.iml
+++ b/.idea/modules/kudens_main.iml
@@ -26,7 +26,21 @@
               </K2JSCompilerArguments>
             </option>
             <option name="k2jvmCompilerArguments">
-              <K2JVMCompilerArguments />
+              <K2JVMCompilerArguments>
+                <option name="noStdlib" value="true" />
+                <option name="languageVersion" value="1.1" />
+                <option name="apiVersion" value="1.1" />
+                <option name="suppressWarnings" value="true" />
+                <option name="coroutinesWarn" value="true" />
+                <option name="freeArgs">
+                  <list>
+                    <option value="$MODULE_DIR$/../../build/kotlinjs/kudens.js" />
+                    <option value="v5" />
+                    <option value="plain" />
+                    <option value="call" />
+                  </list>
+                </option>
+              </K2JVMCompilerArguments>
             </option>
             <option name="_commonCompilerArguments">
               <DummyImpl>
diff --git a/.idea/modules/kudens_test.iml b/.idea/modules/kudens_test.iml
index fdb3b82..63591a0 100644
--- a/.idea/modules/kudens_test.iml
+++ b/.idea/modules/kudens_test.iml
@@ -26,7 +26,21 @@
               </K2JSCompilerArguments>
             </option>
             <option name="k2jvmCompilerArguments">
-              <K2JVMCompilerArguments />
+              <K2JVMCompilerArguments>
+                <option name="noStdlib" value="true" />
+                <option name="languageVersion" value="1.1" />
+                <option name="apiVersion" value="1.1" />
+                <option name="suppressWarnings" value="true" />
+                <option name="coroutinesWarn" value="true" />
+                <option name="freeArgs">
+                  <list>
+                    <option value="$MODULE_DIR$/../../build/kotlinjs/kudens.js" />
+                    <option value="v5" />
+                    <option value="plain" />
+                    <option value="call" />
+                  </list>
+                </option>
+              </K2JVMCompilerArguments>
             </option>
             <option name="_commonCompilerArguments">
               <DummyImpl>
diff --git a/src/main/kotlin/games/perses/game/Game.kt b/src/main/kotlin/games/perses/game/Game.kt
index 8f6185d..a3391ec 100644
--- a/src/main/kotlin/games/perses/game/Game.kt
+++ b/src/main/kotlin/games/perses/game/Game.kt
@@ -37,8 +37,31 @@
         container.appendChild(webGlCanvas)
         container.appendChild(canvas)
 
-        webgl = webGlCanvas.getContext("webgl") as WebGLRenderingContext
-        canvas2d = canvas.getContext("2d") as CanvasRenderingContext2D
+        val canvas2dcanvas = canvas.getContext("2d")
+
+        var webglcanvas = webGlCanvas.getContext("webgl")
+        if (webglcanvas == null) {
+            console.log("webgl context not found, trying experimental-webgl.")
+            webglcanvas = webGlCanvas.getContext("experimental-webgl")
+        }
+
+        if (webglcanvas is WebGLRenderingContext) {
+            webgl = webglcanvas
+        } else {
+            console.log("webgl?", webglcanvas)
+            window.alert("Your browser doesn't seem to support webgl!")
+
+            throw IllegalStateException("Your browser doesn't seem to support webgl!")
+        }
+
+        if (canvas2dcanvas is CanvasRenderingContext2D) {
+            canvas2d = canvas2dcanvas
+        } else {
+            console.log("canvas2d?", canvas2dcanvas)
+            window.alert("Your browser doesn't seem to support 2d canvas!")
+
+            throw IllegalStateException("Your browser doesn't seem to support webgl!")
+        }
     }
 }
 

diff --git a/.idea/modules/kudens_main.iml b/.idea/modules/kudens_main.iml
index d8b2113..0cb94fb 100644
--- a/.idea/modules/kudens_main.iml
+++ b/.idea/modules/kudens_main.iml
@@ -26,7 +26,21 @@
               </K2JSCompilerArguments>
             </option>
             <option name="k2jvmCompilerArguments">
-              <K2JVMCompilerArguments />
+              <K2JVMCompilerArguments>
+                <option name="noStdlib" value="true" />
+                <option name="languageVersion" value="1.1" />
+                <option name="apiVersion" value="1.1" />
+                <option name="suppressWarnings" value="true" />
+                <option name="coroutinesWarn" value="true" />
+                <option name="freeArgs">
+                  <list>
+                    <option value="$MODULE_DIR$/../../build/kotlinjs/kudens.js" />
+                    <option value="v5" />
+                    <option value="plain" />
+                    <option value="call" />
+                  </list>
+                </option>
+              </K2JVMCompilerArguments>
             </option>
             <option name="_commonCompilerArguments">
               <DummyImpl>
diff --git a/.idea/modules/kudens_test.iml b/.idea/modules/kudens_test.iml
index fdb3b82..63591a0 100644
--- a/.idea/modules/kudens_test.iml
+++ b/.idea/modules/kudens_test.iml
@@ -26,7 +26,21 @@
               </K2JSCompilerArguments>
             </option>
             <option name="k2jvmCompilerArguments">
-              <K2JVMCompilerArguments />
+              <K2JVMCompilerArguments>
+                <option name="noStdlib" value="true" />
+                <option name="languageVersion" value="1.1" />
+                <option name="apiVersion" value="1.1" />
+                <option name="suppressWarnings" value="true" />
+                <option name="coroutinesWarn" value="true" />
+                <option name="freeArgs">
+                  <list>
+                    <option value="$MODULE_DIR$/../../build/kotlinjs/kudens.js" />
+                    <option value="v5" />
+                    <option value="plain" />
+                    <option value="call" />
+                  </list>
+                </option>
+              </K2JVMCompilerArguments>
             </option>
             <option name="_commonCompilerArguments">
               <DummyImpl>
diff --git a/src/main/kotlin/games/perses/game/Game.kt b/src/main/kotlin/games/perses/game/Game.kt
index 8f6185d..a3391ec 100644
--- a/src/main/kotlin/games/perses/game/Game.kt
+++ b/src/main/kotlin/games/perses/game/Game.kt
@@ -37,8 +37,31 @@
         container.appendChild(webGlCanvas)
         container.appendChild(canvas)
 
-        webgl = webGlCanvas.getContext("webgl") as WebGLRenderingContext
-        canvas2d = canvas.getContext("2d") as CanvasRenderingContext2D
+        val canvas2dcanvas = canvas.getContext("2d")
+
+        var webglcanvas = webGlCanvas.getContext("webgl")
+        if (webglcanvas == null) {
+            console.log("webgl context not found, trying experimental-webgl.")
+            webglcanvas = webGlCanvas.getContext("experimental-webgl")
+        }
+
+        if (webglcanvas is WebGLRenderingContext) {
+            webgl = webglcanvas
+        } else {
+            console.log("webgl?", webglcanvas)
+            window.alert("Your browser doesn't seem to support webgl!")
+
+            throw IllegalStateException("Your browser doesn't seem to support webgl!")
+        }
+
+        if (canvas2dcanvas is CanvasRenderingContext2D) {
+            canvas2d = canvas2dcanvas
+        } else {
+            console.log("canvas2d?", canvas2dcanvas)
+            window.alert("Your browser doesn't seem to support 2d canvas!")
+
+            throw IllegalStateException("Your browser doesn't seem to support webgl!")
+        }
     }
 }
 
diff --git a/src/main/kotlin/games/perses/sound/Sounds.kt b/src/main/kotlin/games/perses/sound/Sounds.kt
index 806fd54..4efa4dd 100644
--- a/src/main/kotlin/games/perses/sound/Sounds.kt
+++ b/src/main/kotlin/games/perses/sound/Sounds.kt
@@ -10,7 +10,7 @@
  */
 
 class Sound(val name:String, val url: String, val volume: Double = 0.75, val numberOfChannels: Int) {
-    var channels: Array<HTMLAudioElement>
+    var channels: Array<HTMLAudioElement?>
     var nextChannel: Int = 0
 
     init {
@@ -18,24 +18,26 @@
         channels = Array(numberOfChannels, { document.createElement("audio") as HTMLAudioElement })
 
         for (audio in channels) {
-            audio.src = url
-            audio.pause()
-            audio.load()
-            audio.volume = volume
+            if (audio != null) {
+                audio.src = url
+                audio.pause()
+                audio.load()
+                audio.volume = volume
+            }
         }
     }
 
     fun play() {
         //println("PLAYING: $name - $nextChannel")
-        channels[nextChannel].currentTime = 0.0
-        channels[nextChannel].play()
+        channels[nextChannel]?.currentTime = 0.0
+        channels[nextChannel]?.play()
 
         nextChannel = (nextChannel + 1) % channels.size
     }
 
     fun pause() {
         for (audio in channels) {
-            audio.pause()
+            audio?.pause()
         }
     }
 }