Each card has 4 features. A set is composed of 3 cards where each one of the four features are either similar or all are different. The general rule of thumb is "If two cards are something and one is not, it's not a set".
App has 2 modes Hint mode and hard mode, hint mode is more suitable for beginners. In hint mode, you can click the "hint" button to view hints or click the "Rule" button to view rules at any time.
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