Math Club - math games

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1.add Add the calculation symbol
2.add Sum is 15
3.add more mazes
4.add Find Same Number
5.add Cubic Projection
6.add Strange Elevator
7.add Hour Glass
8.add Reaction Speed Testing
9.add Date and Time
10.add Conway's Game of Life
11.add enlightening education of math
12.fix some bugs
13.fix some open errors