Season Week 42 · 2026
Frost Week
Slow and freeze are 30% stronger.
Your best run of the week counts – and your rival waits right above you.
Heal, don’t destroy.
The spirits of Lumen are not your enemies. They arrive with a last spark of light – your towers bring them safely to the sanctuary.
- Free
- Android
- No pay-to-win
- No account needed
Note: the game itself is currently available in German only.
Live from Lumen
- Players
- 5
- Runs
- 53
- Light healed
- 123,906,913
Runs and light count season runs since version 3.0 – exactly like the leaderboards.
This week in Lumen
New waves every week – the same for everyone. Who heals best?
Tower defense, the other way round
Instead of defeating enemies you rescue them. That changes every decision on the board.
12 towers, 10 resonances
Build a deck of 4 towers. Certain pairs strengthen each other – for example when frost and spring work together. You discover these resonances yourself. New towers unlock only by playing.
Weekly season with a rival
New waves every week and a special rule such as Fog, Frost or Storm Week. Your rival is the player directly above you: you see live when you overtake them.
9 spirits, each one different
Nimble dashers, huge colossi, shield spirits that only let strong healing through, hoppers, wisp swarms and wilters that lose their light again. Every kind needs a different tactic.
Fair: no pay-to-win
- Completely free to play. Towers, unlocks, lives or gold cannot be bought.
- Never ads during play – at most occasionally after a finished run, never in your first session.
- Stardust only for cosmetics: glow colours and board designs.
- Optional: no ads, a speed pack (same waves, same points) and a supporter pack.
How it works
A run lasts as long as you hold out. The waves never stop.
Pick a deck
Take 4 towers into the run. The wall is always included.
Shape the path
Walls force the spirits onto longer paths – longer in the light of your towers.
Heal
Bring every spirit to the sanctuary with at least half of its light. Otherwise it costs a life.
12 towers
Every tower has 4 levels, its own role and a story from Lumen. Four of them are your starter deck.
Healer
Healing
A focused beam on the weakest spirit.
Starter deck
The first crystal the keepers broke from the spring bed. It hums softly when a spirit nearby begins to fade.
Spring
Healing
Heals every spirit in range.
Starter deck
Wherever the keepers set a crystal into damp soil, bright water bubbles up overnight.
Amplifier
Support
Boosts the healing of nearby towers.
Starter deck
A star of polished amethyst. It gathers scattered light and sends it back focused.
Frost Crystal
Control
Slows spirits in range.
Starter deck
From the ice of the northern slopes. The cold soothes the ache of the Dusk and lets the spirits pause.
Light Grove
Healing
Grants regeneration over time.
from 150 XP
A young tree with leaves of light. Whoever walks beneath it carries a little of it along.
Blessing Shrine
Support
Blesses spirits: +35% healing received.
from 600 XP
A shrine of mother-of-pearl, raised by the first rescued spirits to thank the keepers.
Stillness Bell
Control
Freezes the weakest spirit.
Starter deck
Cast from the silver of a fallen star. Whoever hears it forgets, for one breath, that they are wandering.
Prism
Healing
Chain healing that jumps to nearby spirits.
from 1,300 XP
A crystal that splits light into colours. Each colour seeks out a spirit of its own.
Pace Pendulum
Support
Nearby towers act faster.
from 2,200 XP
A brass pendulum from the workshop of Lumen’s clockmakers. It counts the time the spirits have left.
Life Spark
Healing
Rescues spirits in need with a burst.
from 3,400 XP
A glowing heart of ruby. It waits patiently and only ignites when all seems lost.
Sunbeam
Healing
Charges up, then heals the leading spirit massively.
from 5,000 XP
A mirror of golden glass that catches the last light of the day and keeps it.
Gold Poppy
Economy
Brings gold after every wave.
from 7,000 XP
A flower that only grows where spirits were saved. Its seeds are pure gold.
Wall
Always included, not part of the deck
Cheap. Reroutes the path. The spirits walk around it and stay longer in the light of your towers.
Old stones from the ruins of Lumen, overgrown with light moss.
10 resonances
When two matching towers stand close enough together, they strengthen each other. The first time in a run you see “Resonance discovered” – after that a band of light connects them.
- Ice SpringFrost Crystal + Spring: Each Spring pulse also slows (20%, 1.5 s).
- Holy GroveLight Grove + Blessing Shrine: Regeneration on blessed spirits works twice as well.
- Light BundlePrism + Amplifier: The Prism jumps to one more spirit.
- Quiet CareStillness Bell + Healer: The Healer prefers frozen spirits and heals them 50% more.
- Noon SunSunbeam + Pace Pendulum: The Sunbeam charges 40% faster.
- Gold BlessingGold Poppy + Blessing Shrine: Blessed spirits give +2 gold on a perfect rescue.
- Ice PrismFrost Crystal + Prism: Prism jumps onto slowed spirits lose only half as much power.
- Water of LifeSpring + Light Grove: Every Spring pulse grants 2 s of regeneration.
- Rescue AnchorLife Spark + Stillness Bell: The Life Spark briefly freezes the rescued spirit (1 s).
- Sun BlessingSunbeam + Blessing Shrine: The Sunbeam blesses its target for 3 s.
9 spirits
They all want to go home. Hover over a spirit or tap it to heal it.
The Chronicle of Lumen
A small story about light – you unlock it chapter by chapter in the game.
Lumen
Lumen once shone in a thousand colours. Every spirit carried its own light, and the light gave things their names.
The Dusk
Then came the Dusk. It drinks the spirits’ light until only a spark remains. If that fades too, the spirit is lost forever.
The Sanctuary
From the rift of the Dusk the spirits wander to the last sanctuary. Only those who arrive with enough light can be rekindled.
You, Keeper
You build crystals that heal instead of destroy. Guide their path, give them light – and bring them home.
Unlocked from wave 10First Sparks
Unlocked from wave 20The Colossus Awakens
Unlocked from wave 30Voices in the Fog
Unlocked from wave 40The Embers
Unlocked from wave 50The Heart of the Dusk
Unlocked from wave 60Endless Light
FAQ
Anything left? The most important answers about the game.
What is HealTD?
A reverse tower defense game for Android: spirits enter the board with only a spark of light, and your towers heal them instead of destroying them. A spirit that reaches the sanctuary with less than half of its light costs you a life.
Is HealTD free?
Yes, completely. Towers, unlocks, lives or gold cannot be bought – only your skill counts. Optional extras are “No ads”, a speed pack (4×/10× game speed, same waves, same points – 1×/2× are always free) and a supporter pack.
Are there ads?
Occasionally after a finished run – never during play, not after every run and never in your first session. Optional reward videos give stardust for purely cosmetic effects.
How does the weekly season work?
Every week (Monday 00:00 UTC) a new season starts with the same waves for everyone and a special rule such as Fog, Frost or Storm Week. Your best run of the week counts for the season leaderboard; there is also an all-time board and the healing ranking.
How is the score calculated?
Every spirit that reaches the sanctuary scores points: share of light × weight (Colossus ×5, Shield Spirit and friends ×2) – rescued spirits additionally × your streak (up to ×1.5). On top comes a wave bonus for every wave cleared (100 × wave). In the season your best run of the week counts and everyone plays the same waves; all-time is your best run ever, Healed the total light you healed. On ties the earlier run ranks higher.
What is the rival?
The player directly above you on the season leaderboard. During your run you see live how far their best run was at the same point – and when you overtake them.
Do I need an account?
No. You only pick a player name for the leaderboards, no e-mail. You can also play offline; runs are uploaded as soon as you are back online. You can delete your account at any time.
When will HealTD be on the Play Store?
Soon. Until then you can download the current Android version here as an APK and install it.
Which devices does HealTD run on?
Android smartphones (64-bit, Android 7 or newer recommended). The game is made for portrait mode. The game itself is currently in German.
Bring the spirits home.
Free for Android. No account, no e-mail – just a player name for the leaderboard.