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When I was playing UNO earlier, I found two strange cards: they were purple and blank, with no number or special sign on them. What is this card for? Is it like a Wild Card or +4 Wild Card? It wasn't mentioned in the instructions.

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Sorry, don't know but am wondering the same thing. Instructions that came with them only have the basic Uno rules, not for the special Frozen cards. I think we will just use them as a Wild. – user8663 Oct 3 '14 at 11:27

These cards are mentioned in Uno instructions — you can use one if you lose or damage one of the other cards, or you can use it to include custom house rules card into the deck. See reference in manual:

What Are These Extra Cards For?

Blank Card - This is a special card that you may use in one of two ways. If a card from your UNO deck is lost or damaged you may use the Blank Card as a replacement. Example: If you find that your deck is missing one of the yellow 7's you would simply replace it by taking the yellow Blank Card, marking a "7" on it and adding it back into the deck.

If you family has a special UNO rule you prefer to play with you may write that rule on the Blank Cards and add them straight to the deck

It says also that you should have 4 of these; maybe you have lost the other two?

4 Blank Cards in each color [new decks]

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We use the white card as any card of your choice as the game becomes interesting and utility of the card is maintained.

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Welcome to Board Games Stack Exchange! While we appreciate you providing an answer, we look for answers backed by official sources, such as rulebooks or designer guidelines. While it's nice to know about a houserule that your group uses, it's not really what the original poster was looking for. – Thunderforge Jun 12 '15 at 0:08
This does not provide an answer to the question. To critique or request clarification from an author, leave a comment below their post - you can always comment on your own posts, and once you have sufficient reputation you will be able to comment on any post. – ICodeForCoffee Jun 12 '15 at 12:55

It can be used to write your own rules. I.E. you can put it down and say everyone pick up 4 cards or everyone switch hands.. and so on. Have fun with it.

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Welcome to Board Games Stack Exchange? Do you have any sources to back this up? Also, this answer seems unnecessary given that there are existing answers that say the same thing (and quote the rules). – Thunderforge Apr 16 at 21:52

I used the blank card in my group session. For example the red blank card was "Name a time you were angry at a family member?". It was interesting and interactive for my students.

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This does not answer the question as it is being asked what is it for rather then what it can be used for. – Joe W Feb 26 at 1:34

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