Homescapes pieces randomness

Some people are voting to close this question as a speculation about developer intent, but that’s not what I’m asking for—I’m more asking for clarification on how a randomness system works, not why it is the way it is.

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I mean, most of you know about Homescapes but I always had a question.

What is the level of randomness when pieces are coming down to the table? As you know, you link 3 or more pieces vertically or horizontally and then others come but how does that random works?

I mean, if it was 100% random, i guess you might have a change to never finish a level or so and that makes me think that there is somehow a controlled random.

Could I have clarification on how the system works?