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UNO RULES

I don't like UNO that much. It's an easy game to play if there's nothing better to do, but after a while it becomes pretty repetitive.
However, I find it pretty funny that every time you play you have to do a diplomatic meeting to agree upon the rules. Everyone thinks their own version is the normal one, and nobody has read the manual.
This page is my list of rules I've encountered. if you have heard of more, feel free to tell me!
Mattel added some optional house rules to their manual, but this happened long after the arguments started. And nobody I know has noticed because, again, nobody has read the manual.

First, the real rules

(I'm going to ignore the points, I've never met anyone who uses them)
7 cards per player. Only one card per player can be played. If you can't play anyting, you must draw a card from the draw pile, which you can use if possible. First player is the one to the left of the dealer.
When you play your next-to-last card, you must say "UNO" before your turn ends. If you don't and other players notice, you must draw 2 cards. Once a player has no cards left, the round is over.
There are 5 Action Cards:

"Draw Two Card": The next player must draw 2 cards and skip their turn. If turned up at the beginning of play, same (whatever that means).
"Reverse Card": The direction of play is reversed. If turned up at the beginning of play, the dealer goes first, and then the direction is reversed.
"Skip Card": Next player skips their turn. If turned up at the beginning of play, the first player skips their turn.
"Wild Card": You can choose the color. If turned up at the beginning of play, the first player chooses.
"Wild Card Draw Four": You can choose the color, and the next player must draw 4 cards and skip their turn. You can only play this one if you don't have a card that matches the color of the discard pile. If turned up at the beginning of play, change card.

Challenging a Wild Draw Four: If you suspect that a Wild Draw Four has been played on you illegally, you can challenge the player. The challenged player must show you their hand. If you were right, they must pick the 4 cards instead. If you were wrong, you must pick up 6 cards in total.

House Rules

you can de-select the ones you don't want and then hide them

Misc.

Drawing cards makes you skip the turn in any case.

Drawing cards doesn't make you skip the turn in any case.

The penalty for not saying UNO is a different number of cards.

Action Cards

The game cannot end on an Action Card.

The game cannot end on a Black Action Card.

Anyone can challenge a Wild Draw Four.

The Wild Draw Four can be played like other Action Cards.

Playing more than one card

If you have the exact same Number Card as the one on top of the Discard Pile, you can jump in and play it at any point.

If you have a card Lineup of three, four, or five consecutive Number Cards, you can play them at the same time.

If you have two or more identical Number Cards, you can play them at the same time.

If you have two or more identical cards, you can play them at the same time.

If you have two or more cards of the same number or action type, you can play them at the same time.

This also applies to Black Action Cards.

This doesn't apply to Black Action Cards.

Playing more than one Action Card also stacks their effects.

Stacking +2 +4

If A plays a +2, B can play another +2 instead of drawing, and C must draw 4 cards. However, if C has and plays another +2, D must draw 6 cards, and so on without limits.

The same rule applies to Wild Draw Four cards.

Draw Two and Wild Draw Four can be stacked together.

Players can play more that one +2.

Players can play more than one +2 or +4.