§ How to · with Forge AI
How to make a Roblox fishing game (with AI)
By Sametcan Tasgiran, Founder & Developer·Published ·Updated
A Roblox fishing game needs five pieces: cast mechanics, bite RNG, a reel mini-game, rarity tiers, and inventory integration. Forge AI generates all five in 56 seconds — including 12 starter fish types.
6 files · 220 lines · 56 seconds · 1 credit. 4 rarity tiers, configurable fish pool.
Cast mechanics
Click and hold to charge cast distance. Release to cast. Bobber lands in water based on charge time and aim direction.
Bite RNG
Random wait 3-15 seconds for a bite. Bobber shakes visibly when bite happens. Players have a 1-second window to react.
Reel mini-game
Hold mouse to reel. Tension bar fills — too high tension breaks the line, too low loses the fish. Sweet spot in the middle. Duration scales with fish rarity.
Rarity tiers
Common (60%), Uncommon (25%), Rare (10%), Legendary (5%). Each tier has a different fish pool and sell price.
Inventory integration
Caught fish add to player inventory. Stackable per fish type. Sells via shop integration for cash.
Per-location fish pools
Different bodies of water (river, lake, ocean) have different fish pools. Bobber location determines available catches.
Files Forge AI ships for this prompt
6 files · 220 lines · 56 seconds · 1 credit
ServerScriptService/FishingManager.lua
Cast validation, bite timing, catch resolution
78 lines
ServerScriptService/ReelMinigame.lua
Tension calculation, fish escape/catch logic
42 lines
ReplicatedStorage/Modules/FishConfig.lua
Per-fish stats, rarity, sell price, location
52 lines
ReplicatedStorage/Remotes/CastBobber
Client cast → server
instance
ReplicatedStorage/Remotes/ReelTick
Reel input stream
instance
StarterGui/FishingUI.lua
Tension bar, fish info popup on catch
48 lines
Sample output: ServerScriptService/FishingManager.lua
--!strict
-- ServerScriptService/FishingManager.lua (Forge AI · excerpt)
local Players = game:GetService("Players")
local ReplicatedStorage = game:GetService("ReplicatedStorage")
local FishConfig = require(ReplicatedStorage.Modules.FishConfig)
local CastBobber = ReplicatedStorage:WaitForChild("Remotes"):WaitForChild("CastBobber")
local fishing: { [Player]: { bobberPos: Vector3, biteAt: number, location: string } } = {}
local function pickFish(location: string)
local pool = FishConfig.byLocation[location] or FishConfig.byLocation.lake
local roll = math.random()
local cumulative = 0
for rarity, weight in pairs({ common = 0.6, uncommon = 0.25, rare = 0.10, legendary = 0.05 }) do
cumulative += weight
if roll < cumulative then
local tier = pool[rarity]
return tier[math.random(#tier)]
end
end
end
CastBobber.OnServerEvent:Connect(function(player: Player, bobberPos: Vector3)
fishing[player] = {
bobberPos = bobberPos,
biteAt = os.clock() + math.random(3, 15),
location = "lake",
}
end)
task.spawn(function()
while true do
for player, state in pairs(fishing) do
if os.clock() >= state.biteAt then
local fish = pickFish(state.location)
-- Notify client of bite, start reel mini-game
ReplicatedStorage.Remotes.BiteEvent:FireClient(player, fish)
fishing[player] = nil
end
end
task.wait(0.25)
end
end)Building a Roblox fishing game
Fishing games are a stealth-popular Roblox genre. Adopt Me's fishing minigame alone has driven billions of plays. The pattern that makes fishing addictive: predictable cast → suspenseful wait → reactive bite → skill-tested reel → variable reward. Forge AI ships the entire pattern in 56 seconds.
The Forge AI fishing prompt produces a 6-file system. FishConfig.lua holds the fish pool — 12 starter fish across 3 locations and 4 rarity tiers. Adding new fish is adding rows. FishingManager.lua handles cast tracking, bite timing, and catch resolution. ReelMinigame.lua runs the tension-based reel where most of the skill expression lives.
Cast mechanics are the engagement entry point. Click and hold to charge — the longer the hold, the farther the cast (up to a configurable max). Release to fling the bobber. The bobber lands in water based on charge and aim. Players quickly internalize the timing and start placing bobbers precisely.
Bite RNG is the suspense layer. After cast, a random 3-15 second wait. During the wait, the bobber sits still. Players watching the bobber for a shake see it the moment it happens. Reaction window is 1 second — slow players miss the bite and have to recast. This creates engagement without requiring constant input.
The reel mini-game is where the skill ceiling lives. Hold to reel; the tension bar fills based on reel speed and fish struggle pattern. Too much tension breaks the line; too little lets the fish escape. The sweet spot is a middle band. Rare fish struggle harder, requiring more precise reel control. Players who master the timing catch more rare fish — which is exactly the progression curve fishing games need.
The rarity tier system drives the long-term grind. 60% common, 25% uncommon, 10% rare, 5% legendary. Common fish sell cheap, legendary fish sell big. Players naturally chase rarer catches as their rod improves. The pool is per-location, so different biomes feel meaningfully different — and exploration becomes a real progression mechanic.
See more on the Luau generator, the game builder, or browse the full blog.
Frequently asked
How do I add a new fish?+
Add an entry to FishConfig.lua: id, displayName, rarity (string), price (cash), location (lake/river/ocean), reelDifficulty (1-5). FishingManager picks it up automatically.
Can players use better rods to catch better fish?+
Yes. Each rod has a 'rarityBoost' attribute that shifts the rarity distribution. A legendary rod shifts the chance for legendary fish from 5% to 15%. Forge can extend with rod tier system.
How does the location pool work?+
FishConfig.byLocation maps location names to fish pools. Bobber position is checked against tagged Water parts; the tag's 'Location' attribute determines which pool to draw from. Multi-biome maps are easy to extend.
What about a fishing competition mode?+
Easy extension: track per-player total catch value over a fixed window (30 minutes). Highest score wins. Forge can generate the competition controller in a follow-up prompt.
How are caught fish sold?+
Fish go to inventory by default. Shop NPC dialogue offers 'sell all fish' option that converts inventory fish to cash via CurrencyManager. Integration is automatic if you have the inventory and currency systems.
Related Forge AI prompts
Roblox inventory system
6 files · 230 lines · 56 seconds · 1 credit. 30-slot inventory + 5-slot hotbar.
Roblox shop system
5 files · 180 lines · 47 seconds · 1 credit. Robux + in-game currency, both server-validated.
Roblox currency system
4 files · 150 lines · 44 seconds · 1 credit. Cash + Gems + premium currency by default.