PROGRESSION / BOSS ROUTE

How to Fish map and walkthrough: islands in order

For the Steam game How to Fish, the practical map is a color-coded route rather than a list of formal island names. Clear each handoff, take the new coordinates, and use the boat radar to find the next stop. This map and full walkthrough is the page to open when you cannot tell what to do next.

Source-backed routeGuide boundary: v1.0.12Last checked 5 Sep 2026
White islandSpider Crab
Green islandGiant Piranha
Yellow islandPufferfish
Red islandTuna → Albatross
Purple islandBowhead → Mutated Bowhead
Quick answer: Lighthouse → Spider Crab → Green island → Giant Piranha → Yellow island → Pufferfish → Red island → Tuna → Albatross → Purple island → Bowhead Whale → Mutated Bowhead Whale. The final handoff is the whale tail to the scientist, followed by the scientist's boat.

Island checklist: catch, handoff, leave

The strongest competitor pages split ordinary catches, named bait and boss encounters into separate lookup layers. Use this compact route checklist in that same order: identify the current request, reserve the route item, then sail only after the handoff changes the next objective.

StopCheck before fishingDo not loseLeave when
White / LighthouseKeeper request and Empty Beer CanSpider Crab trophyKeeper accepts it and the boat-key route is clear
Green / ForestLeech count and Modified Leech clueGiant Piranha bones / skeleton naming variantThe next coordinate appears after the NPC handoff
Yellow / DesertTourist request and Carrot cluePufferfish finThe Tourist accepts the fin and points to Red
Red / RocksTuna bait and the Albatross objectiveThe drop the current NPC requestsThe Red-island objective is marked complete
Purple / VolcanoScientist request and Fish Bucket clueWhale FinThe scientist handoff and ending boat are available
Evidence boundary: the high-level five-island route is cross-referenced by public route pages and the supplied guide. Exact item spelling, quantities, bait consumption and which late encounter advances the state remain needs-verification. For ordinary catches, use the cross-site island catch map.

Route at a glance

StopTrigger / baitBoss or objectiveHandoff that moves the run forward
WhiteGive beer to the Lighthouse Keeper; use the empty can.Spider CrabGive the crab shell to the Keeper → boat key; buy or use radar to locate the next coordinate.
GreenCollect three leeches and give them to the woman; use the leech bait.Giant PiranhaGive the piranha bones back → next island coordinates.
YellowGive the tourist a suitable endangered creature; use the carrot.PufferfishGive the pufferfish fin to the tourist → Red island coordinates.
RedUse the Professional Boss Lure for the tuna; leave the tuna as bait.Tuna, then AlbatrossGive the Albatross head to the quest NPC → Purple island coordinates.
PurpleGive the scientist five animals; use the Fish Bucket.Bowhead Whale, then Mutated BowheadGive the whale tail to the scientist → military boat key and the ending route.

When the walkthrough seems stuck

Most “how do I progress?” reports describe a missed handoff rather than a hidden island. Version 1.0.5 also fixed an island-travel exploit, so treat the boss drop → NPC delivery → new-coordinate chain as the intended route. Exact item names can vary in player descriptions, so use the active NPC request and the route table together.

Player questionFirst thing to checkEvidence state
Can I skip an island?Do not rely on the old skip route; finish the current boss handoff and read the next radar coordinate.Official patch boundary
The NPC will not accept what I caughtCheck whether the request wants a boss trophy or named delivery item, not ordinary meat or a surplus catch.Route + community report
I cannot see the next islandVerify the previous handoff, restart only after saving, and compare the radar marker with the route color.Community report
How do I get the next radar?Return the required boss reward or quest item first; the radar is a navigation aid after the handoff, not a substitute for it.Route cross-check

Terminology note: “White,” “Green,” “Yellow,” “Red,” and “Purple” are convenient radar-color labels used by the supplied Steam guide. They are easier to search than inventing formal island names the game does not clearly display.

Boss order and practical loadout

The useful lesson from the current route guide is that the newest weapon is not automatically the correct answer. Pick for the arena and attack pattern, not for unlock order.

EncounterPractical approachWhy it helps
Spider CrabKnife or brass knuckles; bait a charge and sidestep.A missed charge creates a short punish window.
Giant PiranhaPistol for minions; keep dynamite as a burst option.Clear small fish for health or money before committing explosives.
PufferfishSMG with magazine and recoil upgrades; use trees as spacing tools.Its larger body is easier to hit, but the poison trail makes greedy chasing dangerous.
TunaKeep the SMG; use stairs or the casino table to break its pathing.The fight is more about terrain than the sniper unlock.
AlbatrossSMG with a larger magazine and recoil control; retreat into a building for attacks.Cover lets you reset after the dive or ranged attack.
Bowhead WhalesAssault rifle; keep moving in open ground and watch the lava.Standing still is riskier than giving up a few shots.

How to beat Giant Piranha solo

Cross-checked route, not reproduced here A current Steam discussion with 24 comments, a public boss reference, and the supplied route material converge on the same practical sequence: finish the 3/3 leech request, use the resulting Modified Leech, keep moving while controlling the smaller piranhas, and preserve healing from defeated adds. Players also report using a lit dynamite during the second phase, but that timing remains a community tactic rather than an official rule.

After the kill, pick up the distinctive boss drop and return it to the quest NPC to move the route forward. Public pages use different names for the drop, so this guide does not turn “skeleton,” “bones,” or “tail” into a new exact item claim. See the Steam solo-boss discussion ↗ and the independent boss cross-check ↗; exact HP, damage, timing and player-count scaling remain needs-verification.

The final handoff people miss

  1. Defeat the Bowhead Whale and carry the body to the volcano.
  2. Survive the Mutated Bowhead fight; keep your feet out of fresh lava.
  3. Pick up the dropped whale tail.
  4. Give the tail to the scientist for the boat key.
  5. Start the scientist's boat to trigger the ending. A boss kill alone is not the final interaction.

After the ending: completionist cleanup

A second public guide proposes doing the fiddly achievements after the ending, when the player can return with late-game gear. That is a useful content handoff for the achievement hub, but the return state and all-islands access still need a v1.0.11 replay. For now, use the cleanup table as a checklist, not a guarantee.

  1. Finish the story and record the current save state.
  2. Open the Tab encyclopedia and note missing creature and drip entries.
  3. Do the low-risk cooking, physics and collection attempts before Handyman or Bean.
  4. Keep Bean on a separate timed save; do not mix it with collection cleanup.

Co-op shortcut

Use a simple “runner and shooters” split: the player being chased prioritizes movement, while the others keep the boss in a safe line of fire. Swap jobs if the target changes. This is a tactic reported in the supplied Steam guide, not a developer-documented mechanic.

Primary route referenceCommunity guide, supplied by the user · title: 全 BOSS 攻略|主线流程、武器选择与实战打法 · updated for 1.0.6Open the Steam guide ↗
Post-game cleanup referenceEnglish community guide updated 23 Aug 2026 and written around v1.0.4/1.0.5. Its return-state and cleanup methods are author reference only until replayed on v1.0.11.Open public reference ↗
Cross-checkDestructoid walkthrough, published 23 Aug 2026Read the walkthrough ↗
MAP / KEY / NEXT STOP

How to Fish map, boat key and next island lookup

When the route feels broken, use the last completed handoff as the anchor. This page keeps route facts separate from unverified coordinates or skip claims.

How do I read the How to Fish map or radar?

Use the color-coded route as a navigation aid after the current NPC handoff is complete. The radar points you toward the next route problem; it does not replace the item, dialogue or boss trigger that unlocks it.

How do I get the boat key?

Follow the handoff chain on the route table and check the dedicated radar/key page when a named key is missing. Exact late-route key states should be replayed on v1.0.11 before being treated as universal.

What if the next island does not appear?

Save after the handoff, verify the item was removed or accepted, then reload the session once. If the boss or coordinate is still absent, use the boss-not-visible and lost-items checklists instead of repeatedly consuming bait.

Can I skip islands?

Use the intended handoff order for a stable route. Older community skip or exploit reports are not presented as current mechanics without a reproducible v1.0.11 test.