Voidline: Tower Defense
Help & Support
Need a hand with Voidline? Email support@greenfieldlabs.llc and tell us your device model, iOS version and what happened. The answers below cover the most common questions.
How do I play?
The swarm pours out of the rift and follows the glowing conduit toward your reactor core. Stop it with towers. Tap a tower card at the bottom of the screen, then tap an empty tile to build it there; you can also drag a card onto the board. Towers cost credits: you start each mission with some and earn more by destroying enemies and clearing waves. When you're ready, tap Start Wave. Tap a tower you have built to see its stats, upgrade it, change what it aims at or sell it. A tower sells for 70% of the credits you spent on it, or for everything you spent if the first wave hasn't started yet. You win when the last wave is cleared with your core still standing.
Waves, speed and pause
Before each wave, the line under the wave counter tells you what's incoming. After a wave is cleared, the next one starts by itself after a 12-second countdown; tap Next to call it early and you get 2 credits for every second left. The speed button at the bottom left switches between 1×, 2× and 3×. The pause button at the top left opens a menu where you can resume, restart, open Settings or abandon the mission (tap Abandon twice to confirm). An abandoned mission pays scrap for the waves you cleared.
Towers and upgrades during a mission
The Pulse Cannon, Arc Coil and Cryo Emitter are available from the start. The Plasma Mortar unlocks when you clear Sector 1, the Railgun when you clear Sector 2 and the Prism Lance when you clear Sector 3. Each tower can be upgraded four times during a mission, from Mk I to Mk V, and every Mark costs more credits than the last. Most towers can target the enemy that is furthest along the route (First), the toughest (Strongest), the closest (Nearest) or the furthest back (Last); the Cryo Emitter affects everything in its range.
Core integrity, stars and revives
Your core starts every mission with 20 integrity, or more with Hull Plating research. An enemy that reaches the core removes integrity: most remove 1, Aegis, Menders and Fractures 2, Hulks 3 and Dreadnoughts 10. When you win, your stars depend on what you kept: three stars if you lost at most 10% of your integrity, two if you lost at most half, otherwise one. The game keeps your best result for each sector.
Once per mission, when your core falls, you can revive by watching an ad or for 150 scrap. The core gets back half of its integrity, an emergency pulse destroys every enemy near the core and Dreadnoughts are pushed back along the route.
The Armory and why upgrades get more expensive
The Armory is where you spend scrap on permanent research that applies in every mission. Each tower has Damage, Range and a special upgrade of its own (such as faster firing or a larger blast). The Command tab has Supply Line (more starting credits), Hull Plating (more core integrity), Bounty Protocol (more credits per kill) and Recycler (more scrap from missions). Research for a tower is locked until you unlock that tower.
Every level of a research track adds the same bonus but costs more scrap than the level before it. For example, the first level of the Pulse Cannon's Damage costs 30 scrap, the tenth costs 320 and the twentieth, its last, costs 4,400. The game is designed this way: the first levels are cheap, and the last ones are a long-term goal. Each button shows the price of the next level. Research is permanent and can't be reset.
Credits and scrap
Credits exist only inside a mission: you earn them and spend them there, and every mission starts fresh. A supply drop appears after wave 2 and then every four waves; watch an ad to collect extra credits. Scrap pays for Armory research and revives. You earn it for every wave you clear, with a bonus for winning a sector and a larger bonus the first time you win it. Even a lost mission pays for the waves you cleared. You can watch an ad after a mission to double its scrap, claim a free crate every 20 minutes and collect field salvage in the Armory every 5 minutes (both by watching an ad), or buy scrap in the Supply Depot.
What is Endless mode?
When you clear a sector, its Endless mode unlocks. Waves keep coming and keep getting stronger until your core falls. The game remembers your best wave on each sector, and Endless missions pay scrap for every wave you clear.
I bought something and didn't get it
Open Settings (the gear on the home screen) or the Supply Depot and tap Restore purchases. This restores the permanent items: the Starter Pack and Remove Ads (no ads between missions) and the Salvage Doubler (double scrap from every mission). Scrap packs are delivered when the purchase completes; if one didn't arrive, close and reopen the game while connected to the internet so it can finish the purchase, then contact us if it's still missing. If a purchase needs approval (Ask to Buy), the item arrives once it's approved.
Can I get a refund?
Purchases are processed by Apple, so refunds are handled by Apple. Request one at reportaproblem.apple.com.
Where is my progress saved?
Your progress is saved on your device. There is no account and no cloud save. Deleting the game deletes it, and we can't recover it. It is part of your device backups (iCloud Backup or a backup to your computer), so restoring a backup brings it back. Permanent purchases can always be restored with Restore purchases; the rest of your progress, such as stars, research and scrap, can't. A mission isn't saved while you play it: if the game is closed during a mission, you start that sector again.
Ads
This version of Voidline shows placeholder ads only, labelled as test ads: they're generated on your device and don't contact any ad network or track you. An ad can appear between missions. You can also choose to watch one for a reward: a revive, double scrap after a mission, a supply drop, the free crate or field salvage. Buying Remove Ads or the Starter Pack turns off the ads between missions; ads you choose to watch for rewards stay available. See our privacy policy for details.