We have to choose the right color for each triangle. First tap the hexagon on the ground then remember the color for each triangle on door the hexagon. you can tap several times and look at the pattern.
100 floors 74
To open the door you have to find the colors on the sides which have not be lite up by the lights. If you have found the pattern simply tap each triangle several time until the color mach.
For the exact color find this sequence starting from triangle at the bottom in counter clockwise direction :
1.Red - 2.Light Blue - 3.Dark Blue - 4.Yellow - 5.Green - 6.Black. or simply look at the picture above. that's tip for 100 floors 74 game. Read also next floor hint on this site.