There seem to be a couple of bugs in the grading for this game: My solution claimed to work for all the tests, but when it “Validated”, it said it didn’t work for two of them, specifically Large Gap and Fast Start 1. Again, these worked fine when doing testing.
Please read the FAQ as this is one of the most common complaints here. The validation tests are different from tests in the IDE and if those fail then in 99.9% of cases this means that there is actually a problem in your solution. Unfortunately there is no easy way to find where the real problem in your code is and the belief that your code can’t be wrong makes it even harder 
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