Number Detectives Challenge

Click on the rule cards to reveal them. You can reveal rules in any order.

Once a rule is revealed, click on it to highlight all numbers that match that rule. Click again to remove the highlighting.

You can click directly on any number square to cross it out with a red X. Click again to remove the cross.

Add up all the unshaded (not highlighted) numbers to find the target number. Click "Show Target" to check your answer.

Use "Reset Grid" to clear all highlights and crosses, or "New Challenge" to start a completely new game.

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