Fishing Tower Defense Credits, Diamonds & Economy

Economy literacy separates steady progression from feast-or-famine accounts in Fishing Tower Defense. Two currencies dominate routine play — Credits for everyday upgrades and standard bait, and Diamonds (often called Gems in code rewards) for premium bait, selective shop buys, and long-term collection tools like Fish Incense. Premium reroll items such as Premium Dice and Trait Rolls sit adjacent to currency — often code-granted rather than farmed infinitely.

This guide maps earn routes, spending priorities, code injections, and how currencies interact with bait, traits and dice, and beginner progression.

Credits — your daily engine

Credits fund the grind loop:

• Standard bait restocks
• Entry upgrades affecting multiple fish units
• Selling and buying cycles tied to inventory management

How to earn Credits

Defense waves — primary income when pushing appropriate difficulty. If income feels low, drop one wave tier temporarily rather than stall entirely — advice mirrored in how to play.

Selling commons — aggressive sell discipline from how to fish prevents inventory clog and generates Credits from useless catches.

Quests or milestones — check in-game boards and updates hub after patches for new Credit fountains.

Credits should feel renewable every session. If not, your wave tier or sell habits need adjustment before premium spending.

Diamonds — premium decisions

Diamonds are slower to earn and faster to waste:

Earn routes

Promo codes — 2kLIKES commonly grants 5 Diamonds / Gems (working codes).

Milestones and events — follow Discord and supreme stu group.

Robux purchases — optional; wiki focuses on free-to-play routing.

Selective farming — if patch notes reference Diamond drops from high-tier content, verify live before relying on outdated guides.

Spend priorities (general)

1. One high-value premium bait purchase when roster lacks rare roles (bait guide)
2. Fish Incense only during planned extinct sessions (how to get extincts)
3. Extra Trait Rolls only when one roll from a strong base (traits and dice)
4. Cosmetic or low-impact shop tabs — last priority for progression-focused accounts

Diamonds from 2kLIKES are too few to spread across all categories — pick one goal per week.

Premium Dice and Trait Rolls

Not currencies, but economic equivalents:

500kVISITS commonly awards 1 Premium Dice / Trait Roll — redeem via how to redeem.

Treat each roll as costing the same opportunity as partial Diamond reroll bundles — roll capped on viable bases only.

Fish Incense economics

Fish Incense consumes premium budget for skewed rare tables. Never activate without:

• Full bait backup (bait items)
• Cleared inventory slots
• Planned session time
• Post-session trait roll budget

Incense without Diamonds for bait restock mid-session wastes the incense window.

Code rewards snapshot (late July 2026)

Code	Typical reward	Currency type
2kLIKES	5 Diamonds / Gems	Premium
500kVISITS	1 Premium Dice / Trait Roll	Reroll item

Subject to expiry — see expired codes for dead strings.

Spending by progression phase

Phase 1 — First session: Codes → one Trait Roll on best base → Credits bait → waves.

Phase 2 — Early roster: Credits-heavy; Diamonds saved until rare slot missing after multiple sessions.

Phase 3 — Mid game: Mixed Credits upgrades and targeted Diamond bait; incense only with budget cap.

Phase 4 — Collection: Diamond and incense blocks for extincts; Credits still fund maintenance.

Detailed checkpoints on beginner progression.

Economic mistakes

Diamond bait before wave income.

Hoarding Diamonds forever while roster stalls on commons.

Rolling traits instead of buying bait when catches are weak because of bait tier, not traits.

Chasing outdated codes for Credits that never existed in those strings.

Alt farming — violates fair play; risks moderation.

Co-op and community milestones

Group play pushes visit and like milestones that unlock new codes benefiting entire communities with Diamonds and dice. Participate legitimately — macro spam hurts everyone when codes get nerfed or abuse triggers crackdowns.

Related links

• Items hub — all consumables
• Working codes — free premium currency
• Tier lists — where to invest upgrades
• Official wiki links — economy patch notes