←左移、 →右移 、↓下移、 ↑旋转 算法有待更新，细节有待完善。

the KB-plus-plus, a useful keyboard helper tool to help the new learner to learn the keyboard layout of the 4 game mode.

mode1: basic test1->only one keytab, no pressure
mode2: basic test2->all keyboards, no pressure
mode3: advanced test1->all keyboards, time counter
mode4: advanced test2->keyboards remove, time counter