Farm

Tower Defense — The Full Technical Manual

You asked for it. Here is every number, formula, and mechanic in the entire tower defense system. No stone unturned. No variable unlogged. You're welcome.

Grid & Canvas Specifications

Starting Resources

Full starting SB formula: 50 + (Supply Lines tier × 5) + milestone bonus + invested SB

Difficulty Modifiers — Exact Numbers

So on Hard you start with 15 lives (20 − 5), enemies have 50% more HP and move 15% faster, but you earn 30% more SB per wave. Risk and reward, baby.

Map Coordinates

Each map is a series of waypoints on the 16×12 grid. Enemies walk tile-to-tile between them. Here are the exact paths:

Valley is a classic zigzag. Switchback has tight turns from the north. Spiral is a long winding path toward the centre — longest path, best for slow towers.

Complete Tower Specifications

Tower Upgrade Costs & Scaling

Each tower can be upgraded to Lv3 (or Lv4 with Hardened Steel armory upgrade). Upgrade costs scale from the base build cost:

Sell value is always 50% of total investment (build + all upgrades).

Full Upgrade Cost Breakdown Per Tower

Because you deserve to know exactly how much SB you're sinking into each tower.

With the Sturdy Foundations armory upgrade (−10% per tier), a fully upgraded Arrow at tier 3 costs just 35 SB total instead of 50. Every SB counts in the late game.

Effective DPS Analysis

Damage per second at each level, not accounting for range or special effects. Just raw numbers for the spreadsheet enthusiasts.

Lightning's effective DPS is tripled when all 3 chain targets are in range. Fire's DOT adds 3 dmg/tick over 3 seconds on top of the direct hit. Cannon's splash means its effective DPS multiplies with enemy density. Frost DPS is low but the 50% slow makes every other tower more effective.

Enemy Stat Scaling Per Wave

Enemies per wave: min(35, 5 + floor(wave × 1.5)). The cap of 35 prevents lag on mobile.

HP multiplier:

• Waves 1–30: 1 + wave × 0.15 (linear)
• Waves 31+: 5.5 × 1.08(wave − 30) (exponential)

Then multiply by difficulty HP modifier (0.7 / 1.0 / 1.5).

Enemy HP at Selected Waves (Normal Difficulty)

Past wave 30 the exponential scaling gets brutal. A wave 50 Orc has over 2,000 HP. On Hard difficulty, multiply all those numbers by 1.5. Good luck.

Boss Mechanics

Boss waves occur every 10 waves, plus every 5 waves past wave 30. A single boss spawns alongside the regular wave.

Boss HP formula: 500 × (1 + bossNumber × 0.5), then multiplied by the exponential wave scaling past wave 30. The wave 50 boss has nearly 7,000 HP on Normal. On Hard: 10,490 HP. It moves at 0.4 speed though, so you have time — just not enough towers.

SB Reward Formula — Complete Breakdown

Per-wave SB earned:

reward = round((5 + wave × 2 + goldMines × 2) × armoryMult × difficultyMult)

Where:

• armoryMult = 1 + Golden Treasury tier × 0.2 (max 1.6 at tier 3)
• difficultyMult = 0.8 (Easy) / 1.0 (Normal) / 1.3 (Hard)
• Boss waves add: 50 × bossNumber on top

SB Earned at Selected Waves (Normal, No Upgrades, No Gold Mines)

Each Gold Mine adds +2 SB per wave. Three Gold Mines over 30 waves = +180 SB. With max Golden Treasury (×1.6) and Hard difficulty (×1.3), the same 30 waves yields around 2,610 SB. That's 2,610 JB per run.

Investment System — ROI Analysis

Invest up to 600 JB before a run to receive up to 200 bonus starting SB (3:1 rate). Is it worth it?

200 extra starting SB lets you build several towers immediately — a Gold Mine (40 SB), a Sniper (50 SB), and still have 110 SB left for Arrows and Cannons. That Gold Mine generates +2 SB per wave. Over a 30-wave run that's +60 SB earned.

Note: JB cashout from TD has diminishing returns above 100 SB earned. A 670 SB run pays ~269 JB, not 670. Invest strategically — big investments help you survive more waves, but returns taper off.

Ghost Evasion Mechanics

Ghosts have a 50% dodge chance against projectile hits. Each projectile rolls independently. However, Fire tower DOT bypasses evasion entirely — the damage-over-time effect modifies HP directly without a hit check. Ghosts are rendered at 50% opacity to look spooky.

Optimal anti-ghost strategy: Fire towers. Their direct hit might miss, but the DOT always lands. Lightning chains also roll dodge per target, so statistically 1.5 of 3 chain hits connect.

Tower Synergies & Placement Theory

Watchtower + Snipers: Sniper base range is 5 tiles (200px). A nearby Watchtower adds +10%, giving 5.5 tiles (220px). At Lv3 with Crystal Optics tier 3 (+45% range), a Sniper covers 7.25 tiles — nearly half the map.

Frost + Cannon: Frost slows enemies to 50% speed. Slower enemies bunch up. Bunched enemies take more cannon splash hits. A single Lv3 Cannon can hit 4–5 slowed enemies per shot.

Gold Mine placement: Gold Mines don't attack, so put them in dead zones away from the path. They pay for themselves in 20 waves (40 SB cost, +2 SB/wave). Build early.

Lightning chains: Lightning jumps to up to 3 targets within 2 tiles of each other. Place it where the path doubles back on itself for maximum chain potential. On Spiral map, the centre is ideal.

Armory Upgrade Costs — Full Resource Requirements

Each armory tier costs more. The cost multipliers per tier are ×1.0, ×1.5, ×2.0.

Complete Modifier Stack at Max Upgrades

If you max every armory upgrade, here's what you're working with on Hard difficulty:

With fully stacked modifiers, wave 30 on Hard earns round(65 × 2.08) = 135 SB per wave. That's the dream. Getting there requires approximately 23 Stone Bricks, 32 Planks, 9 Iron Bars, 12 Crystal Lens, 9 Gold, 2 Hardwood, 14 Bread, and 9 Rope. So start farming.

Cashout — SB to JB Conversion

When your run ends (you die), all SB earned during the run converts to JB at a 1:1 rate. That's it. No multiplier, no tax, no hidden fees. A 30-wave run earning 1,255 SB deposits exactly 1,255 JB into your wallet. Invest wisely.

The Optimal First 10 Waves (Speedrun Strat)

Wave 1: Build 2 Arrows at the first bend (20 SB). You have 30 SB left.

Wave 2: Save. Slimes die easily.

Wave 3: Build a Frost tower at the second bend (20 SB).

Wave 4–5: Save SB. Upgrade an Arrow to Lv2 after wave 5 (15 SB).

Wave 6: Skeletons appear. Build a Cannon (25 SB) for splash damage.

Wave 7–9: Upgrade towers. Get the Cannon to Lv2 (38 SB).

Wave 10: Boss wave. You should have 2 Lv2 Arrows, 1 Frost, 1 Lv2 Cannon. The boss has 750 HP. It will be tight but survivable. Collect 50 bonus SB.

After wave 10 you should have ~300+ total SB earned. Use it to unlock Watchtower and start stacking range buffs.

Why You Will Lose at Wave 37

Wave 37 is where most runs die. Here's why: the exponential scaling has been compounding for 7 waves. Slimes now have ~170 HP. Orcs have ~680 HP. You're facing 35 enemies per wave. And it's a boss-adjacent wave (if past 30, mini-bosses every 5), meaning you just burned resources on wave 35's boss and haven't recovered economically. The gap between wave 30 (linear) and wave 37 (exponential) is where tower DPS falls behind enemy HP growth. The solution: have 3+ Gold Mines generating passive SB, and invest all of it into Lv3 Snipers with Watchtower range buffs. Or just accept wave 37 as your destiny.