do it like a boss

Author: HandsomeOne

cache.appcache

@@ -1,5 +1,5 @@
 CACHE MANIFEST
-# v1 - 2016-04-26
+# v2 - 2016-05-11
 js/main.js
 js/i18n.js
 css/style.css

js/i18n.js

@@ -9,7 +9,8 @@ i18n['en'] = {
   rule0: "Find a <b>valid</b> JavaScript expression",
   rule1: "whose value is <b>(Number)24</b>.",
   rule2: "Each of the four given numerical digits <b>must appear once</b>, and <b>no other</b> digits are allowed.",
-  rule3: "Besides digits, <b>only</b> these operators are allowed: <code>+</code> <code>-</code> <code>*</code> <code>/</code> <code>%</code> <code>~</code> <code>&amp;</code> <code>|</code> <code>^</code> <code>&lt;&lt;</code> <code>&gt;&gt;</code> <code>(</code> <code>)</code> and <code>x</code>(after a given <code>0</code>).",
+  rule3: "Besides digits, <b>only</b> these operators are allowed: <code>+</code> <code>-</code> <code>*</code> <code>/</code> <code>%</code> <code>~</code> <code>&amp;</code> <code>|</code> <code>^</code> <code>&lt;&lt;</code> <code>&gt;&gt;</code> <code>(</code> <code>)</code> and <code>x</code>(after a given <code>0</code>).<br><small>* Can you do it like a boss? Try not to use parentheses <code>(</code> <code>)</code>.</small>",
+  boss: "",
   rule4: "In additional, to avoid <code>-~</code> from appearing continuously, <code>-</code> is <b>not allowed</b> to be used as a unary operator.",
 };
 i18n['zh-CN'] = {
@@ -20,7 +21,7 @@ i18n['zh-CN'] = {
   rule0: "求一个<b>合法的</b> JavaScript 表达式，",
   rule1: "其值为<b>整数 24</b>。",
   rule2: "四个给定的数字<b>恰好</b>在表达式中出现一次，未给定数字<b>不允许</b>出现。",
-  rule3: "除数字外，表达式中<b>仅允许</b>包含下列运算符：<code>+</code> <code>-</code> <code>*</code> <code>/</code> <code>%</code> <code>~</code> <code>&amp;</code> <code>|</code> <code>^</code> <code>&lt;&lt;</code> <code>&gt;&gt;</code> <code>(</code> <code>)</code> 以及 <code>x</code>(在给定的<code>0</code>后面)。",
+  rule3: "除数字外，表达式中<b>仅允许</b>包含下列运算符：<code>+</code> <code>-</code> <code>*</code> <code>/</code> <code>%</code> <code>~</code> <code>&amp;</code> <code>|</code> <code>^</code> <code>&lt;&lt;</code> <code>&gt;&gt;</code> <code>(</code> <code>)</code> 以及 <code>x</code>(在给定的 <code>0</code> 后面)。<br><small>* 挑战自己！试着不使用小括号 <code>(</code> <code>)</code>。</small>",
   rule4: "另外，为了防止 <code>-~</code> 连续出现，<b>不允许</b>将 <code>-</code> 用作一元运算符。",
 };