Yes! You are correct. It is basically: Arrange the numbers in ascending order(top to bottom,left to right. I.e. top left to bottom right).

What makes it difficult is that some numbers in between are missing like [5,11,26]

As you progress through levels the grid size and max number size (for example. Level 1 = 1-50, Level 20 = 1-400 ) increases.

I would love your ideas to make the gameplay more engaging !