Well there was another solution with a few facts about level 100, but it was deleted, I'd guess because it had as many up votes as down, presumably because the creator didnt have the achievement, luckily, I don't care, I mention this because some of the stats will be from comments on that solution, I dont remember who to credit, but I'll mark it with a *, while I believe it, I can't personally attest to it.
I'm currently level 61, I've won 32% of my games, about as well as you can hope for, having spent no money and not bought any of what I consider "cheat" power-ups(anything but new hand and +50%) with silver coins, so I'll post any tips from playing
Level 100 takes 102k points*
at level 81, you will have about 50k points*
at 61 I have about 25k points
This will be a little misleading because when you start, you'll get, iirc, 84 points for a win without the bonus objective, 126 with the 50% bonus. At level 60 I'm getting ~130 for a win, ~200 with 50% bonus.
What makes it go up is the level bonus, which best i can tell, goes up 5% every 5 levels, and starts at 5, so 1-5 its 5%, 6-10, its 10% et cetera.
So while at level 80, you will only be half way, point wise, youre probably closer to 65%, maybe more, games played wise, because youll be getting an 85% bonus, which is added before the purchased 50% bonus
This level bonus is added after the bonus objective 10 points
At the end of a game, you get half as many silver coins as the amount of points you got, so you'll be getting those a bit faster too
I notice a ton of people not understanding the +4 cards, here's how they work: when you play them , you are not supposed to have the color on the board BEFORE you played that card, so the person you played it against is asked if they think you had that color, if you did, and they say yes, then you have to draw, if you didnt they draw 6, if they draw, they get 4 no matter what
You only get free scratches up to 10, plus one after your coin count reaches 10 or more, you have to actually click the free scratch icon to see the one after reaching 10 though, the timer wont be on the main screen, so you can get up to 19 coins on free scratches, If you had 9, and get two 5's more realistically, 15-17 though
related to above, I try to make sure i go below 10 coins before i quit, to make sure i get two scratches before starting again
add as many friends a possible, everyone can send 5 free gifts a day, more friend, more gifts, the better you do, the higher on their leaderboard youll be, and they probably just sent them to the first 5 people
at the end of the week, you get free silver coins, top 10,000, which is easy, you get 2850, iirc, which is enough to get through a good chunk of the week with 50% bonus, top 1000 is 5700, top 100 is 14250
I always have a new hand power up bought, which I only use on a terrible hand i.e.: 80+% of my cards are 2 colors and I have no color changing . So if i had, say 3 blue 3 yellow and one red, or all yellow and blue. If I have even 1 color changer, I keep it
Buy +50% as much as possible, if you're getting top 1000 weekly, it's probably enough for most people to get through the week using +50% every game. way prioritized over new hand
Don't wast points on the other purchasable cards, unless youre spending real money, or you're doing so well that you're making more silver coins than you spend on +50%s every game
Try to always save a color changer for your last card, I've won countless times, when I likely wouldnt have doing this, two exception:
When you have to change it, or someone will win(obviously)
When everyone else is down to 1-2 cards, and the chance of anyone changing islow (or the two people before you, if you're using a +4)
If someone has uno, and they draw a card, try to remember the color of the pile so you know what they dont have
there are four +4s in the deck and four uno color changers, I like to keep track of them so I know my odds of getting screwed. The deck does get reshuffled in longer games.
be ready when someone has 2 cards, I've seen people up to level 80 forget to press uno
if you get the glitch where you cant see you cards, keep tapping uno, sometimes it does it for you, but if not, you can't with without repeatably hitting uno(because you dont know when you have it)
Edit: sharndowg pointed out, you always get a wild card when using "new hand" After realizing this is true I noticed, even if you have one wild card, you get that exact card back + another from the new hand. This did not work, however, when I had 2 wilds off the bat, on new hand, I got the two I already had. This is very useful if you're flush with points from the leaderboard
good luck, I'd say a safe estimate for number of games, again, unless you pay real money, would be 800-1000