Structured guide · progression
100 Days at Sea crafting guide: tiers and build choices
A reliable map of the crafting system, with the unverified cost table kept out of the final answer.
Fandom’s Crafting & Structures page and TechWiser’s crafting guide both organize the system around seven crafting tiers connected to Bonfire progression. That shared structure is publishable; individual costs, exact unlock wording, limits, and production output still need a current in-game UI check.
Seven tiers, one progression question
Think of the tiers as a planning map, not a promise that every item becomes available under an identical UI label. The sources agree on the seven-step shape, while the Stage 3 ledger flags exact gates and material naming for verification.
| Tier | Use this row for planning | Publication status |
|---|---|---|
| Tier 1 | Read the starter set and establish what the current Bonfire unlocks. | Shared structure Exact item list not stated. |
| Tier 2 | Plan basic raft pieces and early utility around the first stable loop. | Shared structure Exact costs withheld. |
| Tier 3 | Check the utility candidates that support food, materials, navigation, and repair. | Shared structure Current UI gate needs proof. |
| Tier 4 | Compare the next defensive or resource upgrade against your actual bottleneck. | Shared structure Do not infer cost from a list. |
| Tier 5 | Reserve higher-tier materials for a plan; do not spend them just to fill the menu. | Shared structure Item availability can change. |
| Tier 6 | Use the progression map to identify a later goal, not an early mandatory route. | Shared structure Exact item list not stated. |
| Tier 7 | Verify the end of the current crafting progression before publishing a full database. | Shared structure Production details need a fresh build check. |
Core materials and naming caution
The material family that appears across the crafting research is Wood, Metal, and a third adhesive-like item whose English naming is inconsistent across sources: Glue, Goo, or Green Gum. Until the item label is checked in the current UI, this guide keeps the alternatives visible instead of silently merging them.
| Material family | Safe working description | Do not assume |
|---|---|---|
| Wood | A recurring building and crafting input in the researched guides. | A fixed yield, best route, or exact early cost. |
| Metal | A recurring crafting and utility input in the researched guides. | That every guide’s Metal source or amount is current. |
| Glue / Goo / Green Gum | A source-naming conflict that needs the in-game item label. | That the three names refer to one item or have identical recipes. |
What should you build first?
For a first run, choose the tool that closes the problem you are actually hitting. Pro Game Guides and TechWiser both surface Sawmill, Crab Trap, and Map Radar as useful early candidates; that makes them good planning prompts, not a universal tier list.
Sawmill for a Wood bottleneck
Consider it when collecting raw Wood is slowing down the next raft or base step. Do not publish a cost or output rate without the current UI.
Crab Trap for a food bottleneck
Consider it when food, not construction, is the part of the loop that keeps breaking. The exact production behavior remains unverified.
Map Radar for a navigation bottleneck
Consider it when the value of the next expedition is limited by finding a destination. Its current cost and display behavior need a fresh check.
TechWiser provides a detailed candidate cost list, but the Stage 3 rules require more than one guide’s table before treating exact costs as stable. Publishing an attractive but untested table would make the page look complete while increasing the chance of misleading a player.
Crafting verification checklist
- Open the current Bonfire and crafting UI and record the exact tier label.
- Copy each item name exactly, including Glue/Goo wording.
- Record cost, unlock condition, limit, output, and dismantle behavior separately.
- Mark the screenshot/build date so an update can be compared later.
Sources and confidence
The seven-tier claim is the only structured progression detail promoted as a shared fact here. The rest is either a route suggestion or an explicit verification boundary.