How you will test only 3rd level of Mario game

The question is little ambiguous to answer but i try as below:

If we have each of the Levels split into individual modules for testing where we can functionally test just the 3 rd level by running the particular module only and use "Stub" if required to mock the levels 1 and 2 as if they are connected.
Note: In this case we cannot check the integration flow from prior flows 1 and 2 so you might not see the credits/scores achieved from previous levels as we mocked them.

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If all the levels are handled separately, then we can change the status from the backend i.e the database and then test the 3rd level of the game.

I test based on the trial version or else am tell based on the 3rd level game pictures.