Help and guide

Goal of the game

Your planet is protected by a shield. Enemies fly at it in endless waves – every hit costs shield. Build satellite towers on three orbits and survive as many waves as you can. When the shield drops to zero, the run is over.

Waves, energy and score

Every wave brings more and stronger enemies, and every fifth wave a boss. Between waves you get a few seconds of rest. Every kill gives energy (for building and upgrading) and points for the leaderboard.

Build, upgrade, sell

Tap or click a free build slot (hexagon) and pick a tower. Tap a built tower to upgrade it (three levels) or sell it – you get part of the energy back. The circles on the playfield show the range, the dashed one the range after upgrading.

The towers

Laser from level 1

Cheap and fast. Ideal against single targets and nimble enemies.

Rocket from level 1

Slow rockets that explode – hits groups and swarms.

Frost field from level 3

Slows every enemy in its field and damages them steadily. Works against armour too.

Railgun from level 5

Huge range and massive damage per shot – perfect against bosses and armoured cruisers.

The enemies

Asteroids from wave 1

Slow, tough and in large swarms.

Alien ships from wave 3

Fast and agile – they weave from side to side.

Splitter asteroid from wave 6

Bursts into three fast fragments when destroyed. Stop it far out.

Drone swarm from wave 8

Four nimble drones at once. Splash damage and frost clean up.

Armoured cruiser from wave 11

Heavy armour shrugs off weak hits. Railgun and frost crack it.

Boss every 5 waves

Every fifth wave: a mothership with massive armour.

Special waves and supply capsules

Some waves come with a special rule. It is announced at the start and shown in the wave line.

Meteor shower

Only asteroids, but many more of them.

Solar storm

Towers fire slower, kills give more energy.

Nebula

Shorter range, a little more energy.

Golden wave

Kills give much more energy.

Supply capsule: crosses the playfield. Shoot it down for bonus energy. It never harms the planet.

Level, stardust and upgrades

After every run you get experience and stardust – the further you get, the more. Higher levels unlock new towers. Spend stardust in the pause menu on permanent upgrades: stronger shield, more starting energy, more tower damage. Special feats unlock achievements with a one-time stardust reward – find them all in the pause menu under “Achievements”.

Leaderboard and nickname

Pick a nickname in your profile to appear on the leaderboard. There is a weekly ranking (resets on Monday) and an all-time ranking. The wave reached counts first, then the score. Results are checked on the server.

Account and switching devices

No sign-up needed: your account is stored in this browser. To continue on another device, create a recovery code in your profile under “Switch device” and enter it there. Keep the code safe – it works like a password.

Symbols

• Damage per hit
• Damage per second (frost field)
• Slows enemies down
• Range
• Shots per second
• Explosion radius
• Energy – price for building and upgrading
• Stardust – for permanent upgrades
• Still locked – unlocks at a higher level

Keyboard shortcuts

← → ↑ ↓

Select a build slot (left/right along the orbit, up/down between orbits)

1 – 4

Build tower 1–4

Enter

Open or confirm a build slot

U

Upgrade tower

T

Change the tower’s target mode

F

Change speed

M

Sound on/off

P

Pause

FAQ