After meeting Ma Fishface in The Sinking City 2, she will give you the second Leyden Jar and will help you with getting the third one if you bring her a special device: Antikythera. This is a time travel machine that will help you go back in time and bring back the third Leyden Jar. Faye will initiate the time travel, and you will get to know more about the origins of the Leyden Jar and also about the backstory of Ma Fishface.
Once you are back from the time travel, you will find the heartless statue that was first seen in the Cold Storage room outside the Ma Fishface Shop. First, you should place the red heart that you grabbed from the safe in the statue, and then solve its puzzle.
The statue has multiple hands coming out of it, each one holding a different item. You need to shoot the items in this order:
Keep in mind that shooting these items will not use any of your bullets. So, it's okay if you miss shots or shoot in the wrong order. You will have unlimited tries without wasting a single bullet.
If you shoot the items in the correct direction, the whole statue will crumble down, giving you a blue heart as a reward. Now, you need to get back to the same statue in the Cold Storage room. This is the same room in the basement that you opened using the Snowflake Key. To get there, you can just head to the Pub on the second floor and climb down the ladder.
As soon as you put the blue heart inside the statue, you will get a depleted Leyden Jar. Now, all you need to do is recharge it, and you will have three working Leyden Jars that will open the entrance to the ship.
In case you are curious how you should have found the correct order, it was written in an evidence piece that you find when picking up the red heart. The evidence file is named Cryptic Riddle.
With the statue puzzle solved, you are almost at the end of your journey to the Fish Market. So, make sure to loot any remaining room or safe that you have missed so far. The number of enemy spawns will also increase from this point, which requires you to escape from the fights as long as possible and save your ammo for mandatory battles ahead, like the one you will face when recharging the Leyden Jar.
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