100 Days at Sea Walkthrough: Complete Day 1–100 Survival Guide, Raft Building, and Island Exploration

Welcome to this 100 Days at Sea walkthrough, a practical survival guide covering your journey from Day 1 to Day 100. Whether you're struggling to survive your first nights, looking for efficient raft-building strategies, or preparing for dangerous island expeditions, this guide will help you establish a reliable survival routine.

Developed by Stranded Devs, 100 Days at Sea is a Roblox multiplayer ocean survival game set in the mysterious Bermuda Triangle. Players gather resources using a harpoon, expand floating rafts, explore islands, discover weapons, and defend themselves against hostile threats.

The ultimate objective is simple: survive 100 days at sea. However, achieving that goal requires careful resource management, smart construction, coordinated exploration, and consistent preparation.

This walkthrough divides your survival journey into manageable stages. Exact resource costs, enemy behavior, and available equipment may change with updates, so always check the current in-game information.

Days 1–10: Collect Resources and Establish Your First Raft

The opening days are about establishing a safe foundation. Avoid unnecessary risks while learning the game's gathering, crafting, and survival mechanics.

Step 1: Learn the Harpoon Gathering System

Your harpoon is an important tool for collecting resources from the surrounding ocean.

Start by identifying floating materials and practicing how to retrieve them efficiently.

Follow this early-game routine:

1. Observe nearby floating resources before moving around your raft.
2. Use your harpoon to collect accessible materials.
3. Prioritize resources needed for raft expansion.
4. Check available construction options before spending materials.
5. Continue gathering until you have enough supplies for essential improvements.

Avoid wasting resources on decorative structures during your first few days.

Step 2: Expand Your Starting Raft

Your raft functions as your home, workspace, and primary defensive position.

A useful early layout should provide space for movement, storage, and future construction.

Focus on:

• Basic flooring: Create enough room to move without crowding.
• Storage organization: Keep important supplies accessible whenever storage options are available.
• Crafting space: Reserve an area for construction-related equipment.
• Defensive positioning: Leave room for protective structures.
• Expansion paths: Avoid layouts that make future upgrades difficult.

A compact, organized raft is often easier to maintain than a large structure built without planning.

Step 3: Prepare Before Nightfall

As you approach your first nights, prioritize survival over exploration.

Check your available resources, inspect the raft, and familiarize yourself with defensive equipment.

If enemies threaten your raft, use the safest available position to defend it.

Days 1–10 objective: Build a stable raft, establish consistent gathering habits, and survive without losing essential resources.

Days 11–30: Upgrade Your Raft and Begin Island Exploration

Once your basic survival routine becomes reliable, the next priority is expanding your capabilities.

This stage introduces a balance between resource collection, raft improvements, and exploration.

Step 4: Build a More Efficient Raft Layout

Instead of expanding randomly, organize your raft into functional areas.

Adapt this layout to the structures available in your current game version.

Step 5: Prepare for Island Expeditions

Island exploration is an important part of progressing through 100 Days at Sea.

However, leaving your raft without preparation can expose you to unnecessary danger.

Before exploring an island:

1. Review your current supplies and available equipment.
2. Carry an appropriate weapon if you have obtained one.
3. Identify a safe route back to your raft.
4. Explore nearby areas before moving farther inland.
5. Collect useful resources and investigate notable locations.
6. Retreat when the risk becomes greater than the potential reward.

Avoid assuming every island is safe.

Step 6: Establish an Exploration Routine

A reliable exploration cycle follows three stages:

Prepare → Explore → Return

Prepare your equipment, investigate the island, and return to your raft before your supplies or defensive readiness become dangerously low.

Days 11–30 objective: Improve your raft's organization, explore islands safely, and acquire equipment that supports longer survival.

Days 31–60: Strengthen Defenses, Find Weapons, and Handle Enemies

The middle portion of your survival journey should focus on consistency.

Instead of pursuing every possible discovery, identify weaknesses in your current setup.

Step 7: Reinforce Your Defensive Position

Your raft should provide enough space to respond when hostile threats appear.

Useful defensive principles include:

• Keep important equipment away from exposed edges when possible.
• Maintain clear movement routes between raft sections.
• Avoid placing essential structures where they obstruct combat.
• Repair damaged areas whenever the game provides suitable mechanics.
• Reserve resources for emergency construction or replacement.

The exact defenses available depend on the current version.

Step 8: Improve Your Combat Readiness

Weapons can make dangerous encounters more manageable, but having equipment does not eliminate the need for positioning.

During combat:

1. Identify the approaching threat.
2. Avoid unnecessary exposure.
3. Maintain enough space to reposition.
4. Attack when you have a safe opportunity.
5. Retreat if the encounter becomes unfavorable.

Do not assume every enemy requires the same strategy.

If you encounter a powerful enemy or boss-like threat, observe its behavior before committing valuable equipment or supplies.

Step 9: Coordinate Multiplayer Survival

100 Days at Sea supports multiplayer gameplay, allowing players to cooperate throughout their survival journey.

A coordinated team can divide responsibilities:

• Gatherer: Collects floating ocean resources.
• Builder: Maintains and expands the raft.
• Explorer: Investigates islands and searches for equipment.
• Defender: Watches for threats and supports combat.

These are suggested team responsibilities, not confirmed official character classes.

Days 31–60 objective: Maintain strong defenses, improve combat readiness, and establish dependable exploration and gathering routines.

Days 61–100: Late-Game Survival Strategy and Final Walkthrough

By the later stages, your goal should shift from rapid expansion to protecting your progress.

You do not need to explore every location or construct the largest possible raft to pursue the 100-day survival objective.

Step 10: Review Your Survival Setup

Before continuing toward Day 100, inspect your current situation.

Address obvious weaknesses before taking unnecessary risks.

Step 11: Reduce Unnecessary Expeditions

Late-game exploration should have a clear purpose.

If you already possess sufficient resources and suitable equipment, consider spending more time maintaining your raft.

Explore when you need specific supplies, equipment, or progression opportunities.

Avoid dangerous detours simply because an unexplored island is nearby.

Step 12: Maintain a Repeatable Survival Routine

A practical late-game routine is:

1. Check the raft for vulnerabilities.
2. Gather resources when reserves are insufficient.
3. Organize and prepare essential equipment.
4. Explore only when necessary.
5. Respond carefully to hostile threats.
6. Repeat until you reach Day 100.

Keep track of the in-game day counter rather than assuming that real-world playtime corresponds directly to survival progress.

Step 13: Reach Day 100

As the final days approach, prioritize survival above experimentation.

Avoid testing unfamiliar combat strategies or committing all your resources to optional construction.

Your final objective is to remain prepared, preserve your raft, and continue surviving until the game registers the required milestone.

Any completion rewards, achievements, or additional objectives should be verified in the current game version.

Days 61–100 objective: Preserve your resources, minimize unnecessary risks, and successfully reach the 100-day survival milestone.

100 Days at Sea Walkthrough FAQ

1. What is the main objective in 100 Days at Sea?

The main objective is to survive 100 days in the Bermuda Triangle. Players collect resources with a harpoon, expand their rafts, explore islands, find weapons, and defend themselves against enemies. Successful progression depends on balancing preparation, exploration, and survival.

2. What should beginners build first in 100 Days at Sea?

Beginners should prioritize a stable raft platform with enough space for movement and essential equipment. Resource organization and defensive preparation are more important than decorative expansion. Build gradually and reserve materials for necessary improvements.

3. Can you complete 100 Days at Sea with friends?

Yes, 100 Days at Sea supports multiplayer survival on Roblox. Playing with friends allows you to coordinate gathering, construction, exploration, and defense. Clear responsibilities and communication can make long survival attempts more manageable.

The most important lesson from this 100 Days at Sea walkthrough is that consistent preparation matters more than reckless expansion. Build a reliable raft, manage your resources carefully, explore with a purpose, and adapt your defenses to the threats you encounter. With a disciplined survival routine, reaching Day 100 becomes a much more manageable challenge.