Why Your Knife Matters More Than Your Rod
In Scale Slimy Fish on Roblox, the core loop is simple: catch slimy fish, then scrape off their scales with your knife to earn cash. While most beginners obsess over upgrading their fishing rod first, seasoned players know that your knife is the real moneymaker. A sharper, higher-tier knife lets you scale fish faster, earning more coins per minute and unlocking premium upgrades sooner. This scale slimy fish knives guide will walk you through every blade in the game, from the starter knife to the legendary endgame upgrades, so you can skip the grind and start stacking cash.
How Knives Work in Scale Slimy Fish
Every knife in Scale Slimy Fish has two main stats: Speed (how fast you can scrape scales) and Efficiency (how many coins you get per scale). Speed is measured in seconds per scrape, efficiency as a multiplier on base coin value. As you progress, you’ll need to balance these stats. Most early knives are slow but efficient, while later knives are lightning-fast but may require precision.
The upgrade system works through the in-game Knife Workshop, unlocked after you catch your first 50 fish. Here, you can purchase new knives outright with cash or use crafting materials (found by fishing and scaling rare fish) to upgrade your existing blade. Each upgrade tier adds +15% speed and +10% efficiency, but the cost scales exponentially. Planning your upgrade path is critical – wasting cash on a mediocre knife can set you back hours.
All Knives Tier List (July 2026)
Based on community testing and official stats (confirmed via the game’s Trello board), here’s the current ranking of all knives available. Prices are in in-game cash.
| Tier | Knife Name | Speed (s/scrape) | Efficiency Multiplier | Cost (Cash) | Notes |
|---|---|---|---|---|---|
| S | Void Razor | 0.3 | 4.0x | 250,000 | Unlocked after catching 100 rare fish |
| A | Serrated Fang | 0.4 | 3.5x | 120,000 | Best mid-late game option |
| B | Coral Cleaver | 0.6 | 3.0x | 60,000 | Great value; purchase after rod is maxed |
| C | Bone Scraper | 0.8 | 2.5x | 25,000 | Usable only until you save for Coral Cleaver |
| D | Rusty Knife | 1.2 | 1.5x | Free (start) | Replace ASAP; it’s painfully slow |
Pro tip: Many new players buy the Serrated Fang (A tier) immediately. While decent, you’re better off using promo codes from the active Scale Slimy Fish code list to get a 1–2 free Luck Potions, then grind for the Coral Cleaver. The videos from the ItsChalls guide (4.7M views) confirm this strategy.
How to Upgrade Your Knife (Step-by-Step)
Upgrading a knife requires visiting the Workshop (gear icon > Knife tab). The process is straightforward, but the costs can be steep. Here’s a breakdown of upgrade tiers for a sample knife (Bone Scraper to Coral Cleaver):
| Upgrade Level | Required Cash | Materials | Speed Gain | Efficiency Gain | Total Cost to Max |
|---|---|---|---|---|---|
| 1→2 | 5,000 | 2 Slime Essence | +0.1s | +0.2x | 5,000 |
| 2→3 | 12,000 | 4 Slime Essence | +0.1s | +0.2x | 17,000 |
| 3→4 | 25,000 | 8 Slime Essence, 1 Sharpening Stone | +0.1s | +0.3x | 42,000 |
| 4→5 | 50,000 | 16 Slime Essence, 3 Sharpening Stones | +0.15s | +0.3x | 92,000 |
Slime Essence and Sharpening Stones drop from scaling fish of certain rarities. Use Luck Potions (from codes like scalescalescale) to increase drop rates.
Important: Do not upgrade a knife beyond level 3 unless you plan to keep it for a long time. The cost jump at level 4 is huge, and you’ll recoup that cash faster by buying a higher-tier knife outright.
Best Knife Upgrades for Cash and Rare Fish
The endgame meta revolves around the Void Razor (S tier). But even that can be upgraded further. Here’s the recommended upgrade path from early game to endgame, based on player reports and the Fray Games update video:
- Start: Use the Rusty Knife only until you have 25,000 cash. Spend that on the Bone Scraper – it’s a 50% speed increase.
- Mid-game: Save for the Coral Cleaver (60,000). This knife will carry you through catching your first 200 fish and unlocking the rare fish fishing area.
- Late-game: Purchase the Serrated Fang (120,000). It’s fast enough to scale legendary fish efficiently.
- Endgame: Grind rare fish for the Void Razor. Once obtained, upgrade it to level 3 using materials from the Abyssal Zone.
Quick comparison of endgame knives after upgrades (level 3):
| Knife | Base Speed | Upgraded Speed (lvl 3) | Base Efficiency | Upgraded Efficiency | Total Upgrade Cost |
|---|---|---|---|---|---|
| Void Razor | 0.3s | 0.15s | 4.0x | 5.2x | 180,000 cash + rare materials |
| Serrated Fang | 0.4s | 0.2s | 3.5x | 4.5x | 95,000 cash + common materials |
The Void Razor costs almost twice as much to upgrade, but the speed boost is dramatic. If you plan to play for many hours, it’s worth the investment.
Tips and Tricks for Maximizing Knife Efficiency
- Use active codes: The codes
10kccu(Lucky Totem) andnewgame(5k cash) give you a head start. Redeem them via Settings > Codes before buying any knife. - Never sell your old knife: The game offers a pathetic 10% refund. Better to keep it as a backup for low-tier fish.
- Pair knife with rod upgrades: A fast knife is useless if you catch fish slowly. Upgrade your rod to at least level 5 before pouring cash into knife upgrades.
- Focus on efficiency first: Speed is tempting, but a 3.0x efficiency knife will earn more per minute than a 2.0x speed knife, because scaling takes only a fraction of the total fishing time.
- Join the official Discord: The game’s team posts exclusive codes and sneak peeks there. Check the Scale Slimy Fish Discord server regularly.
Frequently Asked Questions
Q: What is the best knife in Scale Slimy Fish right now?
A: The Void Razor (S tier) is the best overall knife, with a speed of 0.3s per scrape and 4.0x efficiency. It requires catching 100 rare fish but is worth the grind. For a mid-game alternative, the Coral Cleaver offers the best value.
Q: How do I get Slime Essence and Sharpening Stones for my knife upgrade?
A: These materials drop when you scale fish of “Uncommon” rarity or higher. Using Luck Potions (redeemable with code scalescalescale) increases drop rates. Players report an average of 1 Stone per 10 fish scaled.
Q: Is it worth upgrading the Rusty Knife at the start of the game?
A: No, never upgrade the Rusty Knife. Save your 5,000 cash and buy the Bone Scraper instead. Upgrading the starter knife is a trap that wastes materials you’ll need later. This scale slimy fish knives guide recommends skipping directly to at least the Bone Scraper.
Q: Are there any upcoming knife updates planned?
A: According to the ItsChalls YouTube guide (4.7M views) and game Trello, developers are testing a “Razorfin” knife for the next update, expected mid-July 2026. It will likely have a unique “critical scale” mechanic that multiplies earnings by 10x on rare procs.
For a full video breakdown of all knives and secret upgrades, check out this detailed video guide by ItsChalls. It covers exact timings and hidden strats not found in the official wiki.