The company that made these in China was evidently not thinking hard about the distribution of the English alphabet. The choice of a question mark as the only punctuation is curious. Starting with A, the colors cycle through red, green, yellow, and blue, then back to red, and so on. The last letter is green. For every red face, the opposite face is green.
Every yellow face is opposed to blue.
There is only so much you can do with blocks like this. You can't spell many words, because although you have a total of 96 printed characters, they are distributed over 48 blocks. First, you can of course build things with them. 48 cubical blocks can make structures tall enough that they are fun to knock down. You can spell a limited number of words.