Please help with arrays

[iceking2808]

I want 3 of them to randomly change colors and fade out after that it was necessary to remember and click on them. I thought to make an array of cubes but what next how to do that three of these objects were selected and how to check them. I would be very happy if someone took me through this path step by step and I could understand how it works. Not so much material with arrays in the Internet I can not use what is in the Internet

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So you got 6 cubes, want 3 randomly selected to randomly change colors. When they stop changing colors, they fade to original grey, and you have to guess the last color they were in, right?