Look at your own cards
When playing Cheat, you play against 3 other opponents. Let’s say you put down some cards, then two others, and then the last opponent (for example, Brucey B). If Brucey B plays 2 sevens, and you’re not sure whether or not to let him slide, or accuse him of cheating, look at your own cards.
If you have that number, or any number one value less or one value more of it (in this case, either a 6, a 7, or an 8) then let him slide.
If nobody else accuses him, and your turn is next, then you will only get those 3 choices of number to choose from, and you will not be caught cheating, because you haven’t! (As long as you have one of these 3 numbers, and ONLY one of those 3 numbers. Not 1 seven and 2 sixes together in one play.)