Crater Command
Trade turn-based artillery fire across a destructible crater field and solve each shot before the en...
Scrapline Defense
About Scrapline Defense
Hold the reactor line with scrap-built turrets and split-second spending decisions. Scrapline Defense is a compact lane-based tower defense game built for quick mobile sessions: three attack lanes, five build rows, short prep windows, and enemy waves that escalate from cheap scouts into shielded salvage bots and heavy brutes. Tap an empty pad to place a Welder, Coil, or Mortar. Tap the same pad again to upgrade it. Scrap trickles in over time, but the best economy comes from killing efficiently and surviving long enough to cash the next build phase bonus. One panic button — Overdrive Pulse — can stun and damage every enemy on screen, but its long cooldown means every use matters.
How to Play Scrapline Defense
Controls
- Build: Tap a lane pad on mobile or click a lane pad on desktop.
- Select turret: Tap one of the three build buttons, or press 1, 2, or 3.
- Upgrade: Tap an existing turret pad again to upgrade that turret.
- Overdrive Pulse: Tap the pulse bar, or press Space / E.
- Pause: Press P or Esc.
- Fullscreen: Press F.
- Restart: Press Enter after the line breaks.
Objective
- Stop enemy drones from reaching the reactor at the bottom of the screen.
- Use build phases to place or upgrade turrets before the next wave lands.
- Manage scrap efficiently — every turret placement is a trade-off.
Turret roles
- Welder: Cheap, fast single-target damage for locking down one lane.
- Coil: Applies slow and steady damage to keep fast enemies under control.
- Mortar: Expensive splash damage for dense waves and shield clusters.
Tips & Strategy
- Cover all three lanes early. A perfect left lane means nothing if one scout slips through an empty right lane.
- Upgrade before overbuilding. A level two Welder or Coil usually returns more value than a weak turret stranded in a low-pressure lane.
- Save Pulse for a real stack. Overdrive Pulse is strongest when multiple enemies are already deep in the lanes, especially shield bots grouped around a brute.
- Use Coils to buy Mortar time. Slow effects make splash shots more reliable because enemies bunch up inside the blast radius.
- Build phases are income windows. If you finish a wave cleanly, spend the bonus immediately so the next wave starts with your line already improved.
The Story Behind Scrapline Defense
Scrapline Defense came from a design constraint rather than a theme. We wanted a strategy game that still behaved like the rest of the YoyoArena catalog: portrait-first, readable in seconds, and intense enough for a two-minute session. Traditional tower defense maps sprawl horizontally and ask for long-term planning. Scrapline Defense compresses that genre into a single vertical screen with just three lanes, which means every placement is legible at a glance and every mistake is impossible to hide from.
The build/combat rhythm is the central mechanic. If players could place towers at any time with no phase structure, the game drifted toward frantic tapping instead of planning. Adding short build windows fixed that immediately. Now each wave asks two different questions: what can your current line survive, and what should your next scrap spend solve before the next wave lands? The result feels closer to triage than empire-building, which is exactly the pressure we wanted.
The enemy mix exists to break lazy setups. Scouts punish empty lanes. Brutes punish underpowered damage. Shield bots punish lines that rely too heavily on one turret type. The global pulse ability was added late because some runs needed a single dramatic recovery tool, but the cooldown is long enough that it never becomes a substitute for good planning. Scrapline Defense sits in a different genre than games like Rollout or Trench Dive, but the design principle is the same: pressure should feel fair, immediate, and earned.
Frequently Asked Questions
Is Scrapline Defense endless?
Yes. Waves keep scaling until the reactor breaks. There is no final stage cap, so your score is how long you can keep the line alive.
Can I play Scrapline Defense on mobile?
Yes. The game is designed for portrait touch screens first. Tap build buttons, tap pads to place or upgrade turrets, and tap the pulse bar when you need an emergency clear.
What is the best opening build?
A safe opening is one cheap damage turret in one lane and a slow turret in another. That gives you early lane coverage without spending all your scrap before the first real pressure spike.
Do upgraded turrets matter more than new turrets?
Usually, yes. Early upgrades are very efficient. Once every lane is covered, strengthening your best positions tends to outperform scattering weak towers everywhere.
Is Scrapline Defense free?
Yes. Scrapline Defense is free to play in your browser with no installs and no premium unlock gate.
