|  | The complete list |  |
|  |  | The Sum of Digits card:
Each column contains numbers with an identical sum of digits.
For example, upon the card “27” (sum of digits = 2+7 = 9) the player may discard any card in the column under 9, (i.e. “9”, “18” … “90”). |  | The Multiplication Table card. |  | The Prime Numbers card. |
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