GREY DAY: VIRUS
Quantum-Scale Virus Battle
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Shrunk to quantum scale. The battlefield is inside you.
A real-time arcade shooter across two fronts — Treatment and Defense — armed with Planck energy against a viral invasion.
THE QUANTUM WORLD
The Planck Drive compresses your ship down to subatomic scale. In this microscopic battlefield, white blood cells and viruses tower like kaiju.
TWO FRONTS
- Treatment Mode: Pilot your ship through infected zones, dodging obstacles as viruses swarm in. Your basic attack fires automatically — hold the Laser or Blackhole button to unleash a charged special. Clear enough viruses before time runs out to summon the stage boss, then take it down to win.
- Defense Mode: Drag left or right to orbit your scout ship around the central core while it auto-fires at incoming threats. Protect the core until the timer runs out.
BOSS BATTLES & WEAK POINTS
Massive viral bosses with species-specific attack patterns. Snipe exposed weak points for bonus damage — the bigger the target, the sweeter the reward.
LASER & BLACKHOLE
Hold either button to charge a special attack, up to Lv.3 with permanent shop upgrades. Laser pierces a beam through everything in its path; Blackhole pulls nearby viruses together for one devastating blast.
KILL STREAK BUFFS
Chain kills within 5 seconds of each other to build a streak — up to 8x movement and fire speed at LEGENDARY tier.
RANKING & ACHIEVEMENTS
A global leaderboard for both Treatment and Defense, plus a server-verified achievement catalog. Top rankers automatically receive Planck on the 1st of every month.
OFFLINE PLAY
The game keeps running even without a connection — your progress syncs automatically once you're back online.
Free to play. In-app purchases and rewarded ads are optional.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, HOKWANG LEE, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Identifiers
Data Linked to You
The following data may be collected and linked to your identity:
- Purchases
- Contact Info
- Identifiers
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- HOKWANG LEE
- Size
- 120.4 MB
- Category
- Action
- Compatibility
Requires iOS 17.0 or later and a device with the A12 Bionic chip or later.
- iPhone
Requires iOS 17.0 or later and a device with the A12 Bionic chip or later.
• iPhone XS
• iPhone XS Max
• iPhone XR
• iPhone 11
• iPhone 11 Pro
• iPhone 11 Pro Max
• iPhone SE (2nd generation)
• iPhone 12 mini
• iPhone 12
• iPhone 12 Pro
• iPhone 12 Pro Max
• iPhone 13 Pro
• iPhone 13 Pro Max
• iPhone 13 mini
• iPhone 13
• iPhone SE (3rd generation)
• iPhone 14
• iPhone 14 Plus
• iPhone 14 Pro
• iPhone 14 Pro Max
• iPhone 15
• iPhone 15 Plus
• iPhone 15 Pro
• iPhone 15 Pro Max
• iPhone 16
• iPhone 16 Plus
• iPhone 16 Pro
• iPhone 16 Pro Max
• iPhone 16e
• iPhone 17 Pro
• iPhone 17 Pro Max
• iPhone 17
• iPhone Air
• iPhone 17e
• iPhone 18 Pro
• iPhone 18 Pro Max
• iPhone Duo - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later and a device with the A12 Bionic chip or later.
- iPhone
- Languages
English and 12 more
- English, French, German, Italian, Japanese, Korean, Portuguese, Russian, Simplified Chinese, Spanish, Thai, Traditional Chinese, Vietnamese
- Age Rating
9+
- 9+
- Infrequent
Cartoon or Fantasy Violence
Contains
Advertising
- In-App Purchases
Yes
- Planck 2,100 $1.99
- Planck 1,000 $0.99
- Planck 61,600 (+20% Bonus) $49.99
- Planck 23,200 (+15% Bonus) $19.99
- Planck 11,100 (+10% Bonus) $9.99
- Planck 136,400 (+30% Bonus) $99.99
- Copyright
- © Kaisoft
