It's the same kind of game as Uno, but with an added twist of having an extra discard pile to play to and having both discard piles balanced on a... balancing device.
In Uno you are trying to get rid of the cards from your hand by playing them onto the discard pile by matching color or number. For instance: if the discard pile has a Red 3 on it you can play any other Red card or any color 3. There are also cards that effect the player who goes immediately after you: Skip, Reverse, Draw 2 and Wild Draw 4. Skip makes the person after you miss their turn. Reverse makes the turn order go in the opposite direction(So if you're playing a 4 player game instead of the play order going 1, 2, 3, 4 it goes 4, 3, 2, 1(This takes place immediately, so if you're player number 2 player 1 would get another turn as soon as you lay down the card)) and Draw 2 makes the person who goes after you draw 2 cards instead of taking their turn. Wild allows the player with that card to decide what color the next card has to be, and Wild Draw 4 allows the player to decide the color of the next card AND the next player has to draw 4 cards instead of taking their turn.
Uno Tippo plays the same but there are two discard piles to play onto and if you place one onto a pile and cause the scales to tip over you have to draw 2 cards.
Here is a page with a little info on Uno Tippo:
No, you do not have to play a wild card if you have it in Uno.
Sure, I'd be happy to play Uno with you.
How do you play Uno Spin?
You need a total of 108 cards to play Uno.
No, in Uno you can only play one card at a time.
No, you cannot play doubles in Uno with two players.
You say "uno out" when you have one card left in your hand and you are about to play it in a game of Uno.
"Would you like to play Uno online with me?"
No, in Uno, players can only play one card at a time.
No, you do not have to play a Wild card in Uno to win the game.
"Want to play Uno card switch game with me?"
No, you cannot play Uno without using any cards.