Hidden Oxygen - Will You Find It?

Figure out the correct arrangement of oxygen atoms ?⚫?

Rules:
1) Oxygen atoms cannot be adjacent to each other, even diagonally
2) Numbers next to rows and columns tell how many oxygens should be in them
3) Each carbon atom needs 2 adjacent oxygens

Stuck? Press the hint button, which will explain how to come up with the next move.

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— modified on Jul 3, 2020, 1:34:05 PM

No, the game always resolves around finding 2 oxygen atoms for 1 carbon.
What changes however, is the difficulty. With each new difficulty level, the boards are not only larger, but also require more deduction skills and thinking ahead.