游戏操作：过关游戏。光标键「 」表示向左移动， 「 」表示向右移动。有一定的难度。

The game operate : pass game. the cursor key " " mean to left shift move, " " mean that move rightwards. there is certain difficulty.

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键将光标向左移一格，同时删除它移过的任何字符。

Backspace "Backspace" moves the cursor one space to the left, at the same time erasing any character it moves over.

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