How to Lock Your Base in Merge a Black Hole
Protect your Cash from raiders in Merge a Black Hole. Base lock timers, upgrades, when to lock, post-rebirth habits, and defense tips for offline play.
An unlocked base in Merge a Black Hole is an invitation. Raiders scan lobbies for players who logged off with full Cash storage and no active lock — and those players wake up to empty wallets. Locking your base is the single cheapest defense action in the game, yet it is the most commonly forgotten step before AFK, merge marathons, and rebirth sequences.
This guide explains how base locks work, how to extend timer duration, and how to build habits that survive Sunday updates and busy raid metas.
What base lock does
When your base is locked, other players cannot steal your stored Cash through the raid system. Locks run on a timer — when the timer expires, your storage becomes vulnerable again unless you re-lock manually or through upgrades.
Locking does not pause offline income or merging. It only shields unsecured Cash in base storage. Cash sitting unmerged on your grid follows different rules — see offline Cash and merging for banking strategies that minimize exposed balances.
How to lock your base step by step
- Open the Base menu from the main HUD (location may shift slightly after updates — check controls if buttons moved).
- Select Lock Base or the padlock icon.
- Confirm the lock duration shown — default timers are short until upgraded.
- Verify the padlock indicator stays active on the HUD before closing the game.
- After any rebirth, repeat immediately; rebirth screens reset UI focus and cause most accidental unlocks.
If you play on mobile, enable stay-awake mode until you confirm the lock icon — accidental app switches before confirmation leave bases open.
Upgrading lock duration
Early locks expire quickly — often shorter than a school period or work shift. Upgrade priority:
| Priority | Upgrade type | Why |
|---|---|---|
| 1 | Lock timer duration | Covers full offline windows |
| 2 | Auto-lock reminders | QoL if Star Shop offers them |
| 3 | Raid defense cosmetics | Lower ROI than timer |
Spend Stars on lock-related Star Shop items when they appear in the permanent upgrade row — details in the Star Shop guide. Cash upgrades to base infrastructure also matter; balance spending with merge tier purchases using the cash income tier list.
Redeem promo codes for Cash and Stars before buying lock upgrades so you do not rebuy the same tier after a code bonus arrives.
When you must lock
Lock before every break longer than two minutes:
- Logging off for offline income
- Watching cutscenes or long shop browsing
- Entering raid menus — you are distracted while attacking others
- Starting a rebirth sequence
- Server hopping after Sunday updates when UI defaults may reset
Treat lock confirmation like saving a document — muscle memory beats regret.
Common lock mistakes
Mistake: Assuming merge progress protects Cash. Raiders take storage Cash, not your board tiers, but draining storage removes merge purchase fuel.
Mistake: Locking once per day. Timers expire — set phone reminders if you run short durations early game.
Mistake: Raiding without re-locking after. Players raid until their own timer dies, then get hit while celebrating loot.
Mistake: Ignoring post-update lock bugs. After Sunday patches, rejoin once and re-lock even if the icon looks active — verify on the updates page for known issues.
Lock + merge + offline synergy
Optimal logout routine:
- Merge all duplicates (merge guide).
- Collect passive and offline Cash.
- Reinvest into highest ROI tier from tier list.
- Lock base with maximum remaining timer.
- Note expiry time in real-world clock hours.
When you return, collect income before your lock expires if raiders are active on your server. Use the rebirth calculator during long sessions only after locking — rebirth prep can take minutes of menu time.
PvP mind games
Experienced raiders watch for lock expiry windows. Stagger play schedules or upgrade timers to cover peak raid hours on your server timezone. Coordinating with friends to raid during mutual lock windows reduces retaliation risk.
If you stream, hide server IDs or expect sniping — unlocked clip moments become raid tutorials for others.
Base lock checklist
- Padlock icon visible on HUD? ✓
- Timer longer than AFK window? ✓
- Re-locked after rebirth? ✓
- Checked updates for lock changes this Sunday? ✓
- Stars budgeted for next timer upgrade? ✓ (Star Shop)
Locking is not glamorous, but it preserves every hour of merge and offline work. Make it non-negotiable — raiders thank you when you forget.
Frequently Asked Questions
Quick answers to the most common questions.
How do I lock my base in Merge a Black Hole?
Open the Base menu, tap Lock Base (padlock icon), and confirm. Verify the padlock shows on your HUD before logging off. See controls if the button moved after an update.
How long does a base lock last?
Duration depends on your upgrade level — early locks are short. Extend timers with base upgrades and Star Shop items. Always set AFK shorter than remaining lock time.
Does locking stop offline Cash?
No — offline income continues while locked. Locking only prevents raiders from stealing stored Cash.
Why was I raided if I locked my base?
Your timer likely expired, or you forgot to re-lock after rebirth. Rejoin after Sunday updates and confirm the lock icon is active.
Should I upgrade lock timer or merge tiers first?
Merge tiers until income stabilizes, then upgrade lock duration before cosmetics. Use tier list breakpoints to decide when Cash can spare a defense upgrade.