Fish Market walkthrough: Leyden Jars, keys and codes

Quick code and item answers

1. First Jar, Bolt Cutters and Fish Eye Key

1. Circle the market's right side, climb the ladder, watch the scene and drop into the safe room. Cross Fishing Goods and the Fishing Shop to the bridge.
2. Squeeze past the first starfish obstruction and reach the Construction Site. Take the first Leyden Jar, survive the alarm, use the Jar on the nearby starfish and drop to the Entrance Hall.
3. Take the area map, cross the Market Floor and collect Bolt Cutters in the Weighing Station. Cut the chained Entrance Hall door.
4. Pass the Warehouse into Cold Storage. Take the Fish Eye Key beside the snowflake door, then use it to enter the West Wing.
5. Reclaim the first Jar near the Construction Site. On the return route, temporarily use it on the Guard Post starfish for an inventory upgrade and radio, then take it back.

2. Snowflake Key, Handwheel and optional upgrades

1. After the Market Floor encounter, use the Jar at the Warehouse far door, cut through Packing into Cutting, and climb around the steam pipe to the Auction Room.
2. Take the Snowflake Key, open the Fishing Shop's chained side room, collect its Activator Pen and open the symbol locker for the Minuteman upgrade.
3. Return to Cold Storage, unlock the snowflake door, take the Handwheel and use it upstairs to stop the Cutting Area steam.
4. Open the Locker Room safe with 1496. You receive a grenade-launcher upgrade before finding the weapon itself.

3. Second Jar, grenade launcher and Antikythera

1. Shoot Freddie—the second man from the right and the one not playing an instrument—in the painting. Take Freddie's Urn and use it on the Abandoned Office ward.
2. Enter Ma Fishface's Shop, finish the scene and take the second Leyden Jar.
3. Use both Jars on the Weighing Station starfish door and take the grenade launcher.
4. Use and reclaim both Jars through the West Wing shortcuts until you can place both at the double doors. Take the Antikythera, then retrieve both Jars.
5. On the return route, open Salt Storage with I, IV, IX, XVI and take its grenade-launcher upgrade and Essence.

4. Heart of Ice, third Jar and the ship

1. Follow Ma Fishface's memory sequence. The Old Shop safe code is 6294; take the Heart of Stone.
2. Use it on the multi-arm statue and shoot the arms in this clue order: kneeling person, octopus, Deep One statue, hourglass, Leyden Jar. Take the Heart of Ice.
3. Use the Heart of Ice on the Cold Storage Frozen Statue, then recharge the Depleted Leyden Jar at the Construction Site while pulling red-lit switches during the enemy waves.
4. With three Jars, open all three starfish at Broken Hold. On the wrecked ship, shoot wall blisters from range, use the final safe room and prepare multiple loaded weapons and healing items.

Shoggoth boss

Do not waste ammunition on its body. Activate the three arena devices to expose Shoggoth's eyes, shoot the eyes, and repeat. Keep moving between devices as its attacks accelerate. For the full combat breakdown, use the boss guide.

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