Progressive UNO allows draw cards to be stacked. If a Draw Two card is played against you, and you have another Draw Two card, you can play it instead of drawing. Then the player after you must draw four cards, unless they have another Draw Two to continue the stack.
Wild Draw Fours can also be stacked this way, but if bluffing is turned on, any of them can be challenged, increasing the penalty according to the number of cards stacked.
Note that you can't stack a Draw Two on top of a Wild Draw Four, or vice versa. They have to be the same type of card.
Jump-In UNO (planned; not yet implemented)
With Jump-In UNO, if you ever hold a card that's identical to the up-card (same colour and symbol), you can jump in, and play it even if it's not your turn. If you do, play continues with the player to your left.
If you hold two identical playable cards, you can play them back-to-back. You must play them one at a time: that is, play one card, reach back into your hand, then play another card. This gives the player to your left the chance to 'jump in' and stop you from doing this.
You can't jump in with a Wild card, or play two of them back-to-back.
Seven-0 UNO (planned; not yet implemented)
With Seven-0 UNO, when you play a 7, you swap the rest of your hand with a player of your choice. When a 0 is played, everyone passes their hand to the next player.
If you play a 7 or 0 as your last card, it doesn't have the special effect and you go out normally.
Remember that you still need to call UNO if you play a 7 or 0, and receive a hand with only one card.
Chain UNO (planned; not yet implemented)
Chain rules allow you to play more than one card with the same symbol back-to-back. This makes it easier to change the colour if you have a chain of cards. However, you must play the cards one at a time: that is, play one card, reach back into your hand, then play another card.
Action cards can be chained this way:
- Reverse: Each card reverses the turn order. This means that if you chain an even number of cards, nothing happens.
- Skip: One player is skipped per card chained. You can't skip yourself this way, or skip anyone twice.
- Draw Two: The next player draws two cards per card chained.
Wild cards can't be chained.