The question is ambiguous. Cheating on what? Tic-tac-toe? The bar exam? Your wife? This would affect the gravity of the sin. Cheating on your wife is Adultery. It is clearly against the Commandment. It is ALWAYS a Mortal Sin. In the other types of cheating mentioned, gravity of the sin is relational to the gravity of the act. I would say that cheating on an important test is a Mortal Sin.
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