How many cards are in UNO Flash deck?

These include Skips, Reverses, Draw Twos, Wild and Draw Four Wild cards. You'll find 25 of each color (red, green, blue, and yellow), eight Wild cards, three Customizable cards and one Special Rule card inside the 112-card deck. If you can't make a match, you must draw from the central pile!

Do you have to say how many cards you have in UNO?

Except the “Uno”rule(You should call”Uno” when you have only one card left),you needn't to show how many cards you have. However,you can't hide you card,or misleading others about the number of the cards you have.

What does the hand card mean in UNO Flash?

The challenged player must show you (the challenger) their hand. The unit will instantly go into Slap mode and all of your opponents must race to slap (press) their own Player Buttons as fast as they can. The Player Button of the last player to slap will then flash and that player must draw 2 cards in penalty.