[Dinkum]Island Reef Complete Strategy Guide 2025 Latest Edition | Thorough explanation of how to obtain all rare items, optimal routes, and alpha shark subjugation techniques

Dinkum's popular content, Island Reef, is a special tropical island that can only be accessed every Sunday. In this area, you can get a large amount of expensive rare materials, exclusive creatures, decorative furniture, and powerful equipment that cannot be obtained on regular islands. Many players repeatedly visit this place as it is an important place to dramatically accelerate the monetary policy and island development from mid-game to end-game after the construction of the airport.

In this article, we will thoroughly explain the whole story of Island Reef, and summarize everything from preparations to exploration routes, combat techniques, and item management in detail so that everyone from beginners to experts can achieve maximum efficiency in a single visit.

1. Detailed explanation of Island Reef overview and release conditions

Island Reef is a new biome added to the world of Dinkum in the Summer Sun Update, and is an underwater-centric map with vast coral reefs and small islands. It's randomly generated every week, so each visit is fresh and the exploration is exciting. A dark fog covers the map, increasing your visibility as you move, but a fixed flying airship icon makes navigation easier. The biggest attractions of this area are aquamarine ore, pineapples, limited seafood, rare furniture and weapons from treasure chests, and high-quality materials obtained from defeating alpha sharks. If you use these, you can earn links all at once, expand your island, and migrate NPCs.

The conditions for release are strict and require the construction of an airport. Specifically, speak to Fletch after the second year of the game and when 11 or more NPCs have immigrated to the island. NPCs living in guesthouses are also counted, so actively encourage them to migrate. Airport construction requires a large amount of materials and links. Once built, you can access it by purchasing a boarding pass for 250,000 links at the airport counter on Sunday morning and boarding the airship from the entrance. One boarding pass is for one trip, so consider purchasing multiple tickets for consecutive visits. Please note that acid rain will occur after midnight, and you will receive 1 damage every 2 seconds, so it is essential to plan to return in time. Airships and flying vehicles are not affected by acid rain.

This area is primarily an underwater biome, so swimming and diving will be required frequently. The map size is relatively large, and high-speed transportation methods such as jet skis and helicopters are essential. It is most efficient to make full use of the treasure map to dig up treasure chests on your first visit, and then shift your focus to alpha shark hunting and aquamarine mining from your next visit. Players have reported many cases in which they obtained multiple ice cream makers and pirate gliders in a single visit, and the high degree of randomness allows for an element of luck to be enjoyed.

2. Thorough preparation before departure: complete list of essential items and equipment

The quality of your preparation will determine the success rate of your island reef visit. Considering the ticket price of 250,000 links and the weekly limit, please leave fully loaded with the following items to get the maximum return per expedition. Expand your inventory and use loaner vehicles to supplement capacity.

First, prioritize jet skis, helicopters, and gliders for transportation. Jet skis are ideal for high-speed travel at sea, and helicopters are useful for image hunting and aerial reconnaissance. Gliders are useful for emergency escapes and moving between treasure chests. Secondly, a diving helmet is an absolute must, allowing you to use your gear underwater and preventing oxygen consumption. Obtain by crafting or from treasure chests.

For combat and mining equipment, prepare powerful weapons (trident recommended), shovel (for digging treasure chests), pickaxe (aquamarine), and ax (for destroying shipwrecks). Stock up on 10 or more high HP/attack power buff foods such as the finest steak and young soup for the battle against Alpha Shark. Ideally, you should have at least 100 old keys ready, and exchange them for treasure maps at shark statues. Transport items with a cooler box or loaner car, and streamline chests with a wheelbarrow.

As for other useful items, don't forget to bring an insect net, a fishing rod, and a set of collecting tools. According to the experiences of players, there are many cases where they were able to quickly find the statue with a helicopter and finish 20 maps at once, showing that the preparation that focused on vehicles was successful. To reduce the weight of your equipment, leave unnecessary items on the main island. With this preparation, search efficiency will increase by more than 3 times.

3. Optimal search route and priority after arriving at Island Reef

After arriving, first check the map and start exploring radially from the flying ship icon. The optimal route is as follows to maximize time efficiency.

Step 1: Find the shark statue (10-20 minutes)

A helicopter will circle the sky and give priority to discovering the two statues. Dedicate 5 old keys to each statue to receive a treasure map. You can collect the statue with a total of 20 pieces (100 keys) and take it home as a decoration. When using a map, an X will be displayed on the map, so start digging immediately without putting it off.

Step 2: Shipwreck and Alpha Shark Processing (20-30 minutes)

Patrol the ocean floor on a jet ski and discover 1-3 shipwrecks. Dive with a diving helmet and destroy it with a copper ax or higher to guide the shark. After the battle near land, secure the drop Alpha Shark Teeth.

Step 3: Aquamarine and cooler collection (30-40 minutes)

Destroy underwater rocks with a pickaxe and mine aquamarine. Cooler boxes (up to 10) are scattered on the beach, with beach gear and paint inside.

Step 4: Treasure chest digging and creature capture (remaining time)

Dig the x mark on the map with a shovel and open the chests (green wood, brown wood, green wood). Capture limited fish (Napoleon Fish selling price 15,480), insects (Purple Praying Mantis 6,330 at night), and critters with nets and rods. We will also actively collect pineapples (15,000).

When approaching midnight, we will return immediately. In some cases, there are statues on small islands near the airport, which can help shorten the route. This flow will cover all elements.

4. Complete guide to shark statues and treasure chests: How to efficiently obtain up to 20 maps

Shark statues are the main gimmick of Island Reef, and two of them will appear on the map. If you give 5 old keys to each statue 5 times or more, you will get a treasure map, and when you load the map, the treasure location will be displayed as a red X on the map. Digging with a shovel will reveal a wooden chest containing weapons, ore, and rare furniture (such as an ice cream maker, spinning clothesline, and pirate glider). Once you get 20 pieces, you can pick up the statue itself and use it to decorate your base.

The efficiency method is to bring 100 keys and insert them all immediately after finding the statue. Use the map immediately and give priority to nearby treasure chests. In player reports, there is also an example of obtaining an advanced slingshot with 10 maps. Inside the chest are 5-7 items + paint, and the Aoki chest is a rare item that is only available on the island. A total of 20 chests are expected to yield returns worth millions of links. Choose a flat area to avoid digging mistakes.

5. Guide to defeating alpha sharks: 3 strategies for safely defeating even beginners

The Alpha Shark is a powerful boss that appears when destroying a shipwreck, and the dropped Alpha Shark Teeth are essential for creating the Alpha Trident. It moves at high speed underwater and has a powerful bite, so buffing beforehand is essential. The basic strategy is to guide the diver to land while wearing a diving helmet.

Strategy 1: Land attraction

After destroying the ship, follow the shark to shallow water and fire a series of trident shots on land. Ensure durability with HP buff food.

Strategy 2: Pontoon tile enclosure

Place tiles around the ship to trap the shark and attack safely.

Tactic 3: Jet ski involvement

Make it swim with skis and attack with land jumps. There are many success reports even on the first try.

If multiple appear, please deal with them one by one. The reward will greatly accelerate your monetary policy.

6. Complete collection list of rare materials, creatures, and plants: Selling prices and usage

Covers Island Reef limited items. Selling prices are based on John's goods.

Ore/Material

Aquamarine ore: Mined from seabed rock and processed into 4 pieces using a crusher, it can be sold at a high price.

plants/fruits

Pineapple (15,000): Gathered from trees and is also an excellent cooking ingredient.
Coconut (261): A nut of a tree.
Various corals (4): For decoration and sale. Oncidium (540), Gokurakuchoka (700), etc.

fish

Napoleon Fish (15,480): This is an expensive eye-catching fish.
Clownfish, Greenfish (7,740): You can catch a lot of them by fishing.

insect

Purple Praying Mantis (Night 6,330): A net is required. A total of 15 species appear, including the crow swallowtail (1,980).

critter

Seahorse (3,540): Caught with an underwater net.

You can get ice cream maker (new recipe unlocked), big fan's hand (weapon), etc. from the treasure chest. You can easily aim for a total sales price of over 1 million yen.

7. How to utilize cooler boxes/chests and optimize taking home in large quantities

Coolers (up to 10) are available on the beach and can be taken home empty. It can be carried in a wheelbarrow and rearranged. The same goes for the chests (blue: limited to the island, brown: shared with Deep Mine, green: shared with Underglobe), each containing 5-7 items. Transfer to the main island using a substitute vehicle to prevent inventory pressure. There are many cases where you can make your base more luxurious by taking 3 chests home. Don't forget to use the crusher to increase aquamarine production.

8. Advanced Tips/Danger Avoidance Techniques and Summary

Advanced tips include returning before midnight, bringing too many keys, looking for a helicopter statue, and being careful about acid rain. If a bug occurs, please reload. Island reef is Dinkum's best money making spot if you are prepared. If you practice all the strategies, island development will progress dramatically. Enjoy your weekly visits and live your best tropical life.