Guide

Sandbag 10 gold

Blocks open tiles – use it to reroute enemies. The path must never be fully blocked.

• Any player can demolish Sandbags; the refund (70%) goes to the builder.
• Towers can be built directly on a Sandbag (replaces it).
• Not on the sand (gates, forecourts, bridge) – nothing can be built there.

• Sandbag Emplacement: A tower with at least 3 Sandbags directly around it gets +20% range (not the Depot).

Barbed Wire 30 gold

Slows ground enemies and wounds them. Never wears out. Open ground only – not on sand.

• Speed to 60%
• Damage 5 per second (light)
• Flyers unaffected

• Sitting Duck: Slowed enemies take 30% more armor-piercing damage (Sniper, AT Gun, .50 Cal MG).

Oil 40 gold

Accelerant: doesn't slow, but makes fire devastating. Open ground only – not on sand.

• Enemies on the oil stay oiled for 4 s (dark sheen).
• Built oil never burns by itself and never spreads fire – it only works while a flamethrower hits oiled enemies.
• Flyers unaffected

• Oil + Fire: Oiled enemies take 150% fire damage and keep burning 2× as long.
• Partners: Flamethrower (incl. Napalm), Mortar “Incendiary Shells”.

Electric Fence 90 gold

Electric shock: brief standstill (no damage), the bolt jumps to neighbors. Open ground only – not on sand.

• Stuns for 0.5 s (standstill), then immune to new strikes for 2 s.
• Deals no damage – pure stun. Combines with armor-piercing weapons (Sitting Duck).
• On the edge of a Puddle: if the strike hits an enemy in the water, the whole Puddle is electrified – everything in it is stunned.
• Power area only (Atlas or Power Pylon nearby).
• Chain: the current jumps from tile to tile as long as a ground enemy stands on the neighboring tile (diagonals too) – up to 2 tiles around the fence, at most 64 strikes per trigger. Enemies still immune aren't hit but still conduct.
• Flyers unaffected

• Sitting Duck: Stunned enemies take 30% more armor-piercing damage (Sniper, AT Gun, .50 Cal MG).

Puddle

Natural terrain. Enemies walk through normally – but water conducts electricity.

• Nothing can be built – no towers, no Sandbags, no ground elements.
• Electrified: if an Electric Fence strike hits an enemy standing in the water, the WHOLE Puddle is electrified. Every ground enemy in it is stunned for 0.5 s (no damage), then immune for 2 s.
• How it works: build an Electric Fence right at the shore (on open ground). If an enemy walks over the fence while a second one stands on the water tile behind it, the current jumps over – a chain reaction across the whole water, no matter how far.
• At most once per Puddle per tick, up to 1,500 strikes. Enemies still immune aren't hit.
• Flyers unaffected

• Sitting Duck: Stunned enemies take 30% more armor-piercing damage (Sniper, AT Gun, .50 Cal MG).

Oil Field

Natural terrain. Enemies walk through normally and get oiled.

• Nothing can be built – no towers, no Sandbags, no ground elements.
• Enemies on the Oil Field stay oiled for 4 s.
• Fire (burning ground, incendiary shells, napalm, burning enemies) ignites it: a blaze for 5 s that spreads every 0.5 s to the next part of the same oil field – the whole field burns off.
• Then 10 s cooldown before it can burn again. The oil stays.
• Flyers unaffected

• Oil + Fire: Oiled enemies take 150% fire damage and keep burning 2× as long.
• Deflagration: Burning enemies take 50% more explosive damage (Mortar, Rockets, Artillery).

Electroshock 80 radio · [Z]

Power surge across the whole field: all enemies freeze for 4 s (bosses shorter). Burning and all other effects keep running.

• Cost: 80 radio · Cooldown 120 s (per player)
• Arrives after 1 s
• Hits the whole field – no target needed, the order goes out immediately
• All enemies freeze for 4 s, bosses 50 % of that; burning, marking and slows keep running
• Stationary targets → Sitting Duck (+30 % armor-piercing)

Target Marking 60 radio · [X]

Marks a zone: enemies in it take 50 % more damage from everything – for 2 s after leaving it.

• Cost: 60 radio · Cooldown 60 s (per player)
• Arrives after 0.5 s
• Zone radius 3 tiles for 12 s: enemies in it take +50 % damage from all sources
• Percentage-based – grows with every tower upgrade; lingers 2 s, stacks with the Recon spec

Smoke/EMP Field 50 radio · [C]

Enemies in the zone move at only 40% speed; shields and healing don't work inside it.

• Cost: 50 radio · Cooldown 60 s (per player)
• Arrives after 0.5 s
• Zone radius 3 tiles for 8 s: enemies at 40% speed
• Shields (Diamond, Prism) and healing (Healstone, regeneration) don't work in the zone

Supply Drop 70 radio · [V]

Towers in the zone fire 100% faster and don't overheat.

• Cost: 70 radio · Cooldown 90 s (per player)
• Arrives after 1 s
• Zone radius 3 tiles for 15 s: towers inside +100% fire rate, no overheating

Substation 300 gold · 600 gold · 1,200 gold · 2,500 gold · 5,000 gold · 10,000 gold

+3 pylons per level – more area to build on.

Atlas Guns 60 gold · 100 gold · 200 gold · 1,500 gold · 4,000 gold · 10,000 gold · 25,000 gold

From the start one MG in each of the Atlas's two gateways (10 shots/s, ground and air, targets whoever is closest to the Atlas first, overheats under sustained fire). From level 5 they become autocannons: armor piercing (AP), each level 2.2 times the damage. Level 8: crystal laser – a continuous beam without overheating hits every enemy on its line (up to 12) for 2,500 damage per second plus 10% of their full HP (bosses 2%), armor doesn't count. Range per level: 4.5 / 4.95 / 5.45 / 5.45 / 6.2 / 6.95 / 7.7 / 8.45 tiles.

Armored Gate 400 gold · 1,000 gold · 2,500 gold · 6,000 gold · 15,000 gold

+5 max lives per level (filled immediately). From level two the workshop repairs the gate after every wave without lost lives: 0 / 1 / 2 / 3 / 4 lives.

Searchlight 600 gold · 2,000 gold · 7,000 gold · 20,000 gold

Lights up a circle around the Atlas (radius 7 / 9 / 11 / 13 tiles per level; the searchlights on the pylons sweep across both banks). These tiles count as observed for the artillery, and enemies on them take +10 / 20 / 30 / 40% damage from all towers.

Command Center 800 gold · 2,500 gold · 8,000 gold

Orders last longer (125 / 150 / 175%) and recharge faster (85 / 70 / 55% cooldown); radio cap per minute 125 / 150 / 175%, radio maximum +50 / 100 / 150.

Protocol Zero 50,000 gold

A nuke beneath the Atlas. If lives drop to zero, it detonates instead of Game Over: all enemies within 28 tiles die (no gold/radio), bosses lose 50% of their full HP (a remainder stays). Afterwards lives are refilled to 50%; all upgrades and towers remain, and every further bomb costs 3 times as much as the previous one.

Atlas Defense: co-op and controls

Create a room and share its eight-character code. Up to four players build on one authoritative map with separate wallets. The room creator can remove teammates. Chat opens with Enter or a click. On desktop it stays transparent and can be dragged. Teammates have small colored cursors; team markers last eight seconds.

Double-click an owned tower to select all owned towers of that type and level. Upgrade, specialize, change priorities or sell the selection together. Specialization shows total gold and the amount missing. On touch devices, choose a building and position, then confirm. The lower Build, Orders and More tabs can be collapsed.

Atlas, pylons and bridges

Pylon range comes first in the Atlas menu; Protocol Zero is last. Each pylon range level adds 3% of its original six-tile range, up to ten levels. Existing pylons and connections update immediately. The Atlas power radius remains eight tiles. The pylon limit starts at six and increases by three every 25 waves. Each pylon costs 100 gold.

A defence bridge costs 10,000 gold with shared funding. Choose a valid position on the crystal scar and north or south as the defence side. Ground enemies cross to that side; flying enemies are unaffected. A faint planning preview appears before building. Demolition gives no refund and waits for enemies to leave safely.

Difficulty, waves and gold help

Choose before starting: Relaxed (80% enemy HP), Standard (100%), Hard (125% and 15% extra combat/wave gold), or Ultra (150%, no extra gold). Relaxed and Standard use original Atlas prices; Hard and Ultra keep increased prices. Difficulty is locked during play and leaderboards have separate filters.

Every 25th wave adds another 15% HP. Clearing a milestone awards 250 gold per active player and repairs up to 10% of maximum Atlas health, rounded up. The reward is paid once. Hard's bonus does not multiply starting gold, transfers, refunds, casino wins or fixed milestone rewards.

Each connected player approves 0–25 early waves. The lowest approval applies; up to 25 waves may be active. Gold help transfers 50, 100, 250 or 500 gold to an active teammate without fees. Restart and quit need approval from all connected teammates.

Planning, daily maps and the crystal slot machine

The optional daily map uses the current date in Europe/Berlin as DDMMYYYY (13 October 2026: 13102026). Random maps and manual seeds remain available. Running maps never change at midnight. The wave preview highlights flying enemies, armor and swarms. The tower overview shows counts, levels, specializations, damage, kills and investment.

The crystal slot machine can run in a compact background window while you build. Automatic paid spins must be explicitly enabled and can be stopped. Free spins continue in the background. FPS appears at the upper left.

Rooms and chat stay in server memory and end on server restart. Game saves are disabled. Server leaderboards persist separately.

Compact controls

Click the Atlas in the center to open its upgrades. Wave approval is in the top bar; Space starts or calls waves early with the existing team approval. The lower action bar contains Bridge, Mark, Tower overview and Crystals & radio. Gold help and Leave room are in the co-op settings.

Crystal weapons, shards and radio

Build an owned tower on crystal ground, upgrade it to level 3 and choose a specialization (J/K). Then select Crystal upgrade in the tower menu or press L. Pay with shards. Each additional owned crystal weapon increases the price by 10% of the base cost.

Kills on crystal ground or in a Resonator field add shards worth 10% of the kill reward. Crystal weapon kills add another 10%. Fractions accumulate; active teammates share whole units.

Radio: kills contribute 0.25 and combos 0.1, limited by a shared budget. The budget refills at 36 radio per simulation minute and stores 60; waiting alone does not credit radio. Bosses grant 80 extra radio. The base player limit is 600. The Atlas radio upgrade increases capacity and budget. Radio pays for support orders, which also have cooldowns.

Solo: north only or both sides

Choose your solo defence sides before starting. North only routes future spawns through northern entries. Enemy count, HP and rewards stay the same. With two connected players both sides are enabled. If only one remains connected, the chosen solo rule applies to enemies that have not spawned yet. Living enemies are never moved.

Text chat, emojis and voice chat

In co-op, press Enter or click the room chat. Use ☺ to insert an emoji at the cursor and send it with your message. On desktop, chat stays visible with a transparent background and can be dragged by its title; on mobile, you can collapse it.

Each participant clicks “Join voice” and grants microphone permission to speak. “Mute” switches off your microphone; the volume slider controls the other voices. The participant list shows who joined, is muted or connected. If your browser blocks playback, click “Enable audio playback”.

Voice is optional and limited to participants in the same room. The microphone stops when you leave voice, leave the room or lose the game-server connection. After reconnecting, join voice again. There is no recording. Use the HTTPS game address and preferably headphones. If voices do not connect despite microphone permission, the operator may need to configure a TURN server.