经典数独是一种基于逻辑的数字益智游戏，你需要根据9x9方格上的已知数字，推理出剩余空格中的数字，并且同时需要满足方格中的每一行，每一列，包括每个粗线宫（3x3）内的数字均含1-9且不重复。
玩好数独游戏首先要了解它的特点、要求，然后要运用一些原则和技巧：
1.利用排除法先填可以确定数字的行或列；
2.优先填空格最少的行或列；
3.当应用以上两个原则填好可以确定的和空格最少的行和列之后，其他行或列又有可以确定的数字，循环运用前两个原则填写空格。
游戏特点：
· 4种难度级别 - 简单数独、中等数独、困难数独和专家数独！适合数独初学者和高级玩家！
· 每日挑战 - 完成每日挑战，获得独一无二的奖杯。
· 突出显示重复项 - 避免在每一行、每一列或每一个宫中有重复数字。
· 智能提示 - 提示可以在你遇到困难时提供指导。
· 多种主题 - 选择让您的眼睛更轻松的主题。
· 自动保存 - 退出游戏后继续游戏，不会丢失任何进度。
· 数以千计的关卡谜题，持续海量更新中。
· 直观且非常简单的界面。
· 良好的游戏性，简单的工具，清晰的布局。
选择你喜欢的任意难度。玩容易的关卡可以锻炼大脑，尝试专家级关卡则可以真正地磨炼心智。数独有一些功能，可以让游戏变得更轻松：提示、自动检查以及重复项突出显示。你可以使用这些功能，也可以在没有帮助的情况下完成挑战，一切由你做主！
简单的数字，无穷的思考，缜密的逻辑，解题的乐趣，都能在数独中体现出来，来试试吧，体验数字的魅力！
SUBSCRIPTION PRICING AND TERMS
In Sudoku we offer you the following three subscription options:
1. A weekly subscription costing $0.99 (or equivalent in your currency) per week after a 7-day free trial period.
2. A monthly subscription costing $2.99 (or equivalent in your currency) per month.
3.A yearly subscription costing $12.99 (or equivalent in your currency) per year.
After buying any of the subscriptions, you will remove the non-optional banner and interstitial adverts from the game. In addition, you will get unlimited hints ,unlimited second chance, unlimited fast pencil every day.
This is an auto-renewable subscription. The payment is charged to your account after confirmation. The subscription is renewed unless you unsubscribe 24 hours before the period ends. Your account will also be charged for renewal. The above-mentioned prices are for customers in the United States. Pricing in other countries may change and actual charges may be converted to local currency.
End of trial/introductory periods and subscription renewal:
- The payment will be charged to your iTunes Account after a confirmation of purchase.
- The subscription will be renewed unless you unsubscribe 24 hours before the end of the current period.
- The account will be charged for renewal 24 hours before the end of the current period at the standard cost of the subscription.
- Subscriptions may be managed by the user and auto-renewal may be turned off by going to the users Account Settings after purchase.
- No cancellation of the current subscription is permitted during the active subscription period.
- Any unused portion of the free trial period will be forfeited when the subscription is purchased.
Canceling a trial or subscription:
- In order to cancel a subscription during the free trial period, you need to cancel it through your account in the App Store. This must be done at least 24 hours before the end of the free trial period to avoid being charged.
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