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Please Note: Only your first spin is free. After your first spin, you will receive 1 free spin per every 20 paid spins, and this free spin is called a Mastery Spin.

From Level 2 onwards Mermaids begin swimming around your cove.  You can ask them to search for treasure by tapping them and selecting 'Talk to Mermaid'.

The actual search works like a slot machine and you can choose to gamble coins or rubies. The cost of coin based searches increases very rapidly as you level up, which is why a common strategy is to stay at level 6 and spend days or even weeks doing nothing but collecting coins from merchants and doing coin based mermaid searches. You can win rubies, sapphires, emeralds and even black pearls doing coin based searches!

The percentage increase of coin based spins is very steep at lower levels. From level 14 the increase stabilizes at around 1,3x with every level gained. At level 60 a coin based spin is ridiculously expensive. A table showing costs at every level is shown below.

The odds are clearly tilted to favour "the house" and consistently playing coin based searches will slowly deplete your pile of coins, but the goal is to win gems (mainly rubies) and perhaps even black pearls.

Each "Undersea City" coin based spin will look up a prize in the probability table below FIVE times, and you will receive the sum of these five lookups. "Sunken Ship" looks up three times, and "Kelp Forest" looks up only once. This means that "Undersea City" is essential just five "Kelp Forest" spins made at the same time, so if you stay at level 4 to collect rubies, play "Undersea City" to save time.

The best value for Ruby spins is Level 4. At Level 4, you can collect about 40,000 coins per day from your merchants and spins only cost 60 coins at Undersea City.  Collect as many Rubies as you can when you are at Level 4 because the cost of spins raises sharply and the coins you can collect from Merchants does not go up at the same rate. 

Prizes for coin based mermaid searches
Prize Probability
10% coins returned 0.327409
20% coins returned 0.374181
40% coins returned
50% coins returned 0.074836
60% coins returned 0.024945
80% coins returned 0.002079
90% coins returned 0.004158
100% coins returned 0.006236
110% coins returned 0.004158
120% coins returned 0.002079
10 pearls 0.172132
1 ruby 0.011225
2 rubies 0.005613
25 rubies 0.000935
5 sapphires 0.000880
5 emeralds 0.000044
5 black pearls 0.000009

Applying some simple statistics to the probabilities yields a few interesting results ("Undersea City" assumed):

  • You will win at least 1 ruby with a probability of 8,6% per spin. This means that on average you will win at least 1 ruby every 12 spins and on average your 12 spin ruby prize will be 2-3 rubies.
  • On average, you will win the prize of 25 rubies every 214 spins.
  • The probability of winning the max ruby prize of 125 rubies in "Undersea City" in one spin is 7,16*10^-16 which is a very very small number. This is not going to happen! If you keep playing you will of course win 125 rubies, but it will probably be the sum of several smaller ruby wins.
  • On average, you will win 5 black pearls every 22,717 spins. Do 1,000 spins every day and you will get there within a month!
Costs of coin based mermaid searches
Level Kelp Forest Sunken Ship Undersea City
2 2 6 10
3 6 18 30
4 12 36 60
5 58 174 290
6 176 528 880
7 530 1,590 2,650
8 1,254 3,762 6,270
9 2,784 8,352 13,920
10 4,990 14,970 24,950
11 8,204 24,612 41,020
12 12,724 38,172 63,620
13 19,078 57,234 95,390
14 28,010 84,030 140,050
15 37,080 111,240 185,400
16 50,660 151,980 253,300
17 68,820 206,460 344,100
18 93,086 279,258 465,430
19 125,488 376,464 627,440
20 168,722 506,166 843,610
21 226,374 679,122 1,131,870
22 303,202 909,606 1,516,010
23 405,522 1,216,566 2,027,610
24 541,716 1,625,148 2,708,580
25 704,996 2,114,988 3,524,980
26 917,264 2,751,792 4,586,320
27 1,193,208 3,579,624 5,966,040
28 1,551,934 4,655,802 7,759,670
29 2,018,280 6,054,840 10,091,400
30 2,624,530 7,873,590 13,122,650
31 3,412,654 10,237,962 17,063,270
32 4,437,218 13,311,654 22,186,090
33 5,769,148 17,307,444 28,845,740
34 7,500,656 22,501,968 37,503,280
35 9,751,618 29,254,854 48,758,090
36 12,677,866 38,033,598 63,389,330
37 16,481,990 49,445,970 82,409,950
38 21,427,352 64,282,056 107,136,760
39 27,856,322 83,568,966 139,281,610
40 36,213,982 108,641,946 181,069,910
41 47,078,942 141,236,826 235,394,710
42 61,203,388 183,610,164 306,016,940
43 79,565,168 238,695,504 397,825,840
44 103,435,482 310,306,446 517,177,410
45 134,466,890 403,400,670 672,334,450
46 174,807,720 524,423,160 874,038,600
47 227,250,800 681,752,400 1,136,254,000
48 295,426,800 886,280,400 1,477,134,000
49 384,055,604 1,152,166,812 1,920,278,020
50 499,273,046 1,497,819,138 2,496,365,230
51 599,127,654 1,797,382,962 2,995,638,270
52 718,953,186 2,156,859,558 3,594,765,930
53 790,848,504 2,372,545,512 3,954,242,520
54 869,933,356 2,609,800,068 4,349,666,780
55 956,926,690 2,870,780,070 4,784,633,450
56 1,004,773,024 3,014,319,072 5,023,865,120
57 1,055,011,676 3,165,035,028 5,275,058,380
58 1,107,762,260 3,323,286,780 5,538,811,300
59 1,163,150,372 3,489,451,116 5,815,751,860
60 1,221,307,892 3,663,923,676 6,106,539,460

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