In FirstTry’s Roblox simulator, your character’s weight controls how far you can travel. Spear fish below the surface and bring them to your island aquarium, where each one generates money every second. Eat at a Mukbang Table to gain enough weight to descend into new areas filled with larger fish and sea monsters. Each server fits six players, the fish index contains over 1,800 species, and other players in your server may attempt to take your catch.
Quick answer: Head underwater, harpoon fish, then return to the surface once your bag reaches capacity. Put catches on display to generate $/s, use extras to evolve them, and raise the fat meter to 100/100 to descend. Enter MONSTER and OP under Settings to claim free keys and XP.
Open the game through its Roblox listing.
Harpoon a Fish progression loop
Every system in Harpoon a Fish feeds the next one. Catches turn into cash, cash pays for upgrades, and body weight opens new water. Each pass through the cycle reaches heavier and stranger fish.
| Stage | What you do | What you get |
|---|---|---|
| Dive | Press DIVE at the shoreline | Access to the water |
| Harpoon | Aim, fire, hit the timing mark | Fish in your bag |
| Surface | Press Space when the bag is full | Catches back on the island |
| Aquarium | Place and name fish | Money per second ($/s) |
| Feed and evolve | Give spare fish to displayed fish | Double $/s per evolution |
| Eat | Sit at the Mukbang Table | Fat, which unlocks deeper zones |
How harpooning works: timing wheel, bag limit and spawns
A hit with your harpoon does not guarantee a catch. Instead, a circular gauge appears and an indicator spins around it; click when it overlaps the highlighted sweet spot. A successful attempt brings up a card identifying the fish, its rarity tier and its weight.
Your bag sets the length of each dive. A new account carries only two fish. When the bag fills, the screen shows “BAG FULL! GO FEED YOUR FISH!” and “PRESS SPACE TO RETURN.” Pressing Space sends you back to your island, and the total weight you are carrying appears as you surface.
Fish arrive in groups, with gaps between them. A countdown labeled “NEXT FISH SPAWN IN” tells you when another group will appear. Announcements sent to the whole server also flag rare arrivals and events in particular areas, for example, “TREASURE CHEST IN TOXIC has opened!”
Aquarium income, feeding and evolution
On the island, use the “PLACE A FISH” prompt to add a catch to your aquarium. You’ll then be asked to name it: enter a name yourself, select “RANDOM NAME,” or opt for “NO NAME.” Each fish on display generates cash every second, funding nearly everything else.
Fish you don’t display become food. Open the feed menu on a displayed fish and give it your spare catches. Once it has eaten enough, the EVOLVE option appears, and evolving a fish doubles its $/s. The aquarium starts small, and the first “UPGRADE AQUARIUM!” purchase adds two slots, so more fish earn at the same time.
Getting fat to sink deeper: Mukbang Table and depth zones
Your body, rather than your gear, determines how deep you can go. The fat meter, labeled “Get FAT to SINK DEEPER!”, begins at 0/100. Raise it at the Mukbang Table, which costs $0 during the tutorial. Sit down, and your character rapidly eats foods such as burgers one after another, boosting the meter. Once it reaches 100/100, you can descend beyond the starting waters.
Named regions lie beneath the starting waters: Shipwreck, Ruins, Toxic, Lava and Void. Players generally reach Shipwreck before the other deeper areas. The game cautions that the danger increases with depth, while server messages identify the areas where sea monsters appear.
| Zone | Announced spawn | Rarity |
|---|---|---|
| Shipwreck | Mosasaurus | LEGENDARY |
| Lava | Demon Pliosaur | EXOTIC |
| Void | Riftmaw Manatee | LEGENDARY |
The game’s Roblox page advertises an event called “NEW ZONE??” for Wednesday, October 21, hinting at an area beneath the Void. The zone remains unconfirmed.
Fish rarity and weight examples
Rarity and weight are tracked separately, and a Common fish can easily outweigh an Uncommon or Rare one. These catches come from the starting waters and from early dives into Shipwreck.
| Fish | Rarity | Weight |
|---|---|---|
| Rainbow Trout | Common | 121–172kg |
| Voidstorm River Trout | Common | 148kg |
| Swordfish | Uncommon | 3,943kg |
| Shadow Prawn | Common | 37kg |
| Octopus | Common | 1,761–11,525kg |
| Stripes | Common | 1,202kg |
| Radioactive Amber Chub | Common | 679kg |
| Radioactive Azure Spearfish | Common | 222kg |
| Coin Jaw | Rare | 6,386kg |
| Lionfish | Uncommon | 2,759kg |
| Shadow Barbel Fish | Common | 293kg |
| Tealspot Rockfish | Common | 1,516kg |
| Silver Stingray | Common | 6,658kg |
| Silver Salmon | Common | 778kg |
The Radioactive fish are mutated variants. Your chance of landing mutations goes up with certain harpoons, which are covered in the crates section below.
Tutorial reward, Free Gifts and bag size
The tutorial ends after your first visit to the Mukbang Table. Finishing it shows “TUTORIAL COMPLETE” and permanently adds +3 Bag Size, so your next dive holds five fish instead of two. A new objective, “Talk to Bonzo,” then appears in the corner of the screen.
Timed bonuses are available through the Free Gifts menu. Its opening reward is a Bag Potion granting +10 BAG for three minutes, extending a dive considerably. A later gift awards $50K in cash. In the shop, a free reward also grants five Wood Keys and one Gold Key.
Harpoon a Fish codes and how to redeem them
Codes give XP, keys and potions. Keys open crates for new harpoons, so codes are the quickest early boost. Each code can be used once per player.
| Code | Reward |
|---|---|
MONSTER | 3,000 XP, 3 Ruby Keys, +1% Monetization luck |
OP | 5,000 XP, 3 Ruby Keys, 1 Fat Potion |
RELEASE also goes into the same Codes field. Its reward hasn’t been confirmed, and it may no longer be active.
UPDATE uses the same field. Like RELEASE, its reward is unconfirmed, so treat both as worth a try rather than a sure thing.
If a code fails, check the spelling and capitalization first. Then rejoin on a different server, because an outdated server may not accept new codes. A code that still fails has probably expired or has already been used on your account.
Crates, keys and OP harpoons
The Crates menu is where you get every harpoon. To open a crate, use its corresponding key or spend Robux. You can obtain keys from codes, the free shop reward, starter packs and objective steps. Some completed steps display “STEP COMPLETE! +1 Ruby key.”
| Crate | Key cost | Robux cost |
|---|---|---|
| Wood Crate | 5 Wood Keys | 3 Robux |
| Stone Crate | 1 Stone Key | 9 Robux |
| Gold Crate | 1 Gold Key | 24 Robux |
| Ruby Crate | 1 Ruby Key | 79 Robux |
The menu also offers Diamond and Secret Crates. Among the high-end, overpowered weapons in the Secret Crate are a Knife Sword, a Wizard Staff and void-themed equipment.
| Harpoon | Effect | Found in |
|---|---|---|
| Leopard Spike | +10% Mutation Chance | Ruby Crate |
| Net Launcher | +5% Mutation Chance | — |
| Red Drill | +1% Mutation Chance | Wood Crate |
| Candy Cane | — | Stone Crate |
Leopard Spike is the best early target. The Ruby Keys from MONSTER and OP are enough to open Ruby Crates, and its mutation bonus is ten times the Red Drill’s. Red Drill comes from the Wood Crate, which also drops other drills and bats. That makes it the likely first harpoon for anyone using the free Wood Keys. After you equip a harpoon, the game confirms it with an “Equipped” prompt.
The paid shop sells a few starter offers:
- Bone Starter Pack (39 Robux): $5K/s, a Legendary harpoon and +10,000 XP
- Greenland Hydra (9 Robux): +33% money
- Key Starter Pack 1 (9 Robux): +5,000 XP, five Stone Keys and five Wood Keys
Best baits: crafting with Bonzo the Chef
Bonzo the Chef converts certain fish into bait. He waits on a wooden raft near your island’s shore and greets you with “GREETINGS PLAYER! I AM BONZO. BRING ME FISH.” The Unusual Baits awarded by his quests are the game’s strongest. His first recipe, Crimson Deepstalker Bait, requires three Octopuses.
Stealing fish from other players
A server can hold as many as six players, all fishing in the same ocean. You may target a fish someone else is reeling in and attempt to claim it, but just one player will retain the catch. When a rare fish is announced server-wide, multiple players may go after it; other players can also challenge you for your fish. Your best defense is to complete the catch fast and return to the surface.
Across your playthrough, the fish index records more than 1,800 species and indicates which entries you lack. Display your strongest catches in the aquarium to earn money and evolve them. Progress largely follows a repeating routine: dive, catch, feed, eat, then sink, adding weight and improving your bait with each round.
