ok awesome third levle

src/js/intl/strings.js

@@ -244,6 +244,11 @@ exports.strings = {
     'zh_CN': '语言重置为默认的 {locale}'
   },
   ///////////////////////////////////////////////////////////////////////////
+  'show-command': {
+    '__desc__': 'command output from "show"',
+    'en_US': 'Please one of the following commands for more info:'
+  },
+  ///////////////////////////////////////////////////////////////////////////
   'cd-command': {
     '__desc__': 'dummy command output for the command in the key',
     'en_US': 'Directory changed to "/directories/dont/matter/in/this/demo"',

src/js/level/sandboxCommands.js

@@ -32,6 +32,19 @@ var instantCommands = [
       )
     });
   }],
+  [/^show$/, function(bits) {
+
+    lines = [
+      intl.str('show-command'),
+      'show commands',
+      'show solution',
+      'show goal'
+    ];
+
+    throw new CommandResult({
+      msg: lines.join('\n')
+    });
+  }],
   [/^locale (\w+)$/, function(bits) {
     constants.GLOBAL.locale = bits[1];