Thread:Sitb/@comment-44337082-20191109034525

The Lucky Spin Wiki Page should be updated. I think it would be useful for people to know that you don't have to win the current game you're in to get credit for the achievement. In other words, you'll still get the achievement to show up (at least on Android) if the zombies eat your brains after you get three diamonds.

Also, the odds could be updated. The Wiki says, "The actual likelihood of getting three diamonds is less than 0.463% (as diamonds are less common than anything else), thus, you can take years to complete this and not get close." This isn't true. If you assume each reel is independent, then the actual odds of a "lucky spin" at the beginning of each game/round is closer to 0.0027% because the chance to get a diamond on each of the three reels is about 3%. I wrote down the symbols on each spin playing the game as fast as I could over a number of rounds. Out of 100 spins, a diamond showed up 3 times on each of the first two reels and twice on the third reel. There were about 40-50 spins per game playing this way.

Much more importantly, though, I noticed that once you've played in one game long enough, the odds improve and you are biased towards getting a "lucky spin" (i.e. if you survive enough waves). In fact, the three diamonds start traveling together and you can see them go by together on the same line and you just miss it a few times before you get it.

I thought I'd gather more statistics and while I was concentrating on surviving for a long time to maximum the number of spins per round/game the diamonds started traveling together as I already mentioned. If you play for longer and survive enough waves, you will probably will get the diamonds. I think the odds change or increase beyond a threshold(s).

Anyway, if you speed through, you might take a lot longer to get the achievement or might not ever get it. This is because, in the beginning, if the probability of a "lucky spin" is 0.0027% per spin, you are talking about 51,298 spins to have a 75% probability that you get one or more "lucky spins" after all those spins. At 50 spins per game / round that comes out 1,026 games (more than 500 days at 2 games per day). You can also say that it will take 85,187 spins to have a 90% probability that you get one or more "luck spins" (852 days at 2 games per day which is more than two years). If what I think is true, the odds swing in your favor if you do a good job and don't plant a lot of sunflower plants or plant them near the right side and let the zombies eat them. The odds can't be that low because I finally got this achievement a couple days after I started playing each game longer. I sincerely believe the odds change after you reach a threshold.

My point is that I think you need to do a good job and make it past a bunch of waves and this achievement won't take very long at all. It helps that it doesn't matter if you win the game / round you are playing in to get the achievement.

Good Luck! 