100 Days at Sea Guide: How to Survive to Day 100
Updated 2026-09-02 · Last verified 2026-09-05 · Roblox 100 Days At Sea
The short version: 100 Days at Sea is a Roblox raft-survival game by Stranded Devs. You start on a raft with a harpoon and hatchet, and the goal is to reach day 100. Days last 3 minutes, nights 1 minute 30 seconds, and after every night the day count rises by your day multiplier: x1 at the start, up to x12 from one-time sources, plus x1 for every clear of the corruption dungeon. Past day 100 a helicopter escape plays and everyone still in the server gets 20 pearls. The loop: harpoon floating wood and metal, feed the bonfire to unlock crafting tiers, loot islands, rescue survivors, survive special nights, kill bosses for multiplier, then run corruption. The first night is always a ghost pirate raid.
First 10 days plan
Think in bonfire levels rather than days. This follows the Fandom base-building advice.
- Before lighting the bonfire. The cycle starts only when the bonfire first reaches 100% (or when the pirate stronghold falls). Explore safely, harpoon every floating item, and put wood and metal in the crusher on the crafting table.
- Tier 1. Wooden floors (3 wood) extend the raft. Craft a cooking pot and the small shelter (+1 multiplier).
- Tier 2. Sundial for the day timer, radio to pin the nearest unrescued survivor.
- Fisherman's island, always about 50 m from base. Kill the two buku warriors, free the fisherman, take the dinghy from the hut chest. Put the shelter, sundial and map here on a floor so raids cannot break them.
- Radio towers. Three sit within sight of base. Press each transponder (no need to fight) to locate the small, big and huge rigs. Each rig's purple chest gives a container worth +1 multiplier.
- Tier 3 machines. Sawmills, crab traps, map radar, wrench, then a pizza oven.
- Survivors. Stephen needs no weapons. Madeline needs her cage key dragged over. Erik needs 8 ghost pirates killed, so bring a gun. Companions are a separate pet system.
- Fuel. Two pump jacks or one oil drill; survivors feed the bonfire to max. Wrench the fuel machines afterwards.
- Tier 4 magnets (30 metal, 10 wood, limit 2). Both magnets plus 2+ sawmills equals infinite everything except glue.
- Pirate islands. Free the three keys, clear the stronghold for +1 multiplier, 5 pearls, the ghost cutlass and the galleon bell.
What to craft first (T1 to T3)
| Tier | Craft | Cost | Limit | Use |
|---|---|---|---|---|
| 1 | Wooden floor | 3 wood | none | Only surface you can build on |
| 1 | Small shelter | 1 metal, 5-6 wood (wiki pages differ) | 1 | +1 day multiplier |
| 1 | Cooking pot | 3 metal, 5 wood | 3 | 3 any food to 1 inventory chowder |
| 2 | Sundial | 10 wood | 1 | Shows time left in the day |
| 2 | Radio | 4 metal, 4 wood | 1 | Locates survivors, shows multiplier |
| 3 | Wrench | 3 metal | none | Remove or repair structures |
| 3 | Sawmill | 2 metal, 10 wood | 5 | Periodic wood, pressed by survivors |
| 3 | Crab trap | 8 metal, 12 wood | 3 | Periodic food |
| 3 | Map radar | 4 metal, 9 wood | 1 | Grey islands undiscovered, coloured discovered |
| 3 | Pizza oven | 10 metal, 30 wood | none | 3 any food to 8 seafood slices |
| 3 | Potion table | 5 metal, 10 wood, 1 glue | not documented | Crafts potions from essences |
| 3 | Pump jack | 15 metal, 10 wood | 3 | Periodic fuel, uses 2-3 wood per run (wiki pages differ) |
The full T1-T7 list is on crafting; where each resource comes from is on materials.
How to read the day multiplier
Every finished night adds the multiplier to the day count. All gains are permanent for that game, except containers, which drop back if every copy of a type is broken.
| Source | Gain | Repeatable |
|---|---|---|
| Each rescued survivor (3 per game) | +1 each | No |
| Each container type (shelter + 3 rig containers) | +1 each, +4 total | No |
| Pirate stronghold cleared | +1 | No |
| All islands discovered | +1 | No |
| Ancient squid boss | +1 | No |
| Biome boss (King of the Snow or Lord of Lava) | +1 | No |
| Corruptor slain | +1 | Yes |
Killing Greenbeard on the ghost galleon does not raise the multiplier but adds it to the day count at once. Details on day count.
Which class to pick first
Classes cost pearls in the lobby and are rated 1 to 6 stars. None has a debuff, but the Fandom advice is to save for a 6-star class, ideally Alien Overlord (starts with the UFO and Ray Gun) rather than buy a cheap one. Pearls come from badges, daily login (20 to 50 on some days), the day 100 escape and occasional codes. See the class tier list.
Common questions
- Inventory on PC. The wiki describes an inventory and hotbar (weapons, ammo, chowder, potions) but not the key. Not documented yet.
- Snorflord. A giant boar boss, 1,000 base HP, on its treasure island. Drops a chest with a pizza oven. See bosses.
- Essence. Drops from non-boss entities in five colours; the main potion ingredient. It cannot enter the inventory, so use a sack or storage bin.
- Oil drill. Tier 5, 20 metal, 35 wood, 5 glue. With survivors and wood, one drill maxes the bonfire.
- Achievements. 61 badges as of the 15 August 2026 update, each redeemable once for pearls. Day 100 solo, duo, trio, 4 and 5 players each have one; player count is checked at the moment day 100 is reached.
- Base ideas. Machines and food in base, containers on the fisherman's island, then a spike-trap lane (T5), kraken arms (T6) and autoturrets (T7) for late raids.
Survival tips
- The Anglerfish hunts at night outside the bonfire's limit, and inside base if the bonfire is out.
- Kraken tentacles delete any structure on the tile where they spawn; do not build right outside the bonfire's limits.
- Melee stops being safe against ghost raids after the first two. Use guns or structures.
- Bring about 15 seafood slices into the corruption dungeon. The UFO does not work in dungeons, so keep a boat.
- The cargo ship holds the corruption portal. Death and healing: revive, medkit.
- Map seeds repeat a layout; which seed is best is community-reported, unconfirmed.
Updates
The Fandom Updates page notes the game was updated about weekly as of 1 August 2026.
| Update | Released | Added |
|---|---|---|
| Corruption | 17 July 2026 | Corruption mechanics and dungeon |
| Potions | 31 July 2026 | Potion table, essences, recipes |
| Decorations | 8 August 2026 | Decorations table |
| Survivors | 15 August 2026 | 3 new survivors (6 total, 3 per game) |
| Class | 22 August 2026 | 5 new classes |
| Gunboat | 31 August 2026 | Gunboat (Captain class boat); noted only on the Boats page |
The latest update on the Fandom Updates page is the Class update, 22 August 2026; the Boats page additionally references a Gunboat update on 31 August 2026. Later changes are not documented yet. The HonestGamers beginner guide in the sources returned no readable content at capture time, so nothing here is drawn from it.
Frequently asked questions
How do you increase the day multiplier in 100 Days at Sea?
Every finished night adds your multiplier to the day count, and you raise it with one-time milestones: +1 for each of the three rescued survivors, +1 for each container type (the shelter plus the three rig containers, +4 in total), +1 for clearing the pirate stronghold, +1 for discovering all islands, and +1 each for the Ancient Squid and the biome boss. Slaying the Corruptor also gives +1 and is repeatable.
What is the max multiplier in 100 Days at Sea?
You start at x1 and the one-time sources take you up to x12, after which every clear of the corruption dungeon adds another +1, so there is no fixed ceiling beyond that. Containers are the one gain that can be lost: if every copy of a container type is broken, that +1 drops back off until you rebuild it.
How do you use the oil drill in 100 Days at Sea?
The oil drill is a Tier 5 machine costing 20 metal, 35 wood and 5 glue, and it produces the fuel your bonfire needs. With survivors and enough wood, one drill maxes the bonfire on its own, which is why it replaces the two pump jacks. Wrench the fuel machines away once the bonfire is full.
How do you use the pizza oven in 100 Days at Sea?
The pizza oven is a Tier 3 craft costing 10 metal and 30 wood with no build limit, and it turns 3 of any food into 8 seafood slices, far better than the cooking pot's 3-food-to-1-chowder rate. One also drops from the chest left by the Snorflord boss. Bring about 15 seafood slices into the corruption dungeon.
100 days at sea base ideas: where should you build?
Keep machines and food in the main base, but put the containers, shelter, sundial and map on the fisherman's island about 50 m away so raids cannot break them. Later add a spike-trap lane at Tier 5, kraken arms at Tier 6 and autoturrets at Tier 7. Never build right outside the bonfire's limits, because kraken tentacles delete any structure on the tile where they spawn.