# GREY DAY: VIRUS — Quantum-Scale Virus Battle

> Quantum-Scale Virus Battle (iPhone/iPad app by HOKWANG LEE.)

- Source: https://appshunter.io/ios/app/grey-day-virus/id6801502568 (this page in markdown: same URL + `.md`)
- Developer: [HOKWANG LEE](https://appshunter.io/developer/1896763756)
- Category: Games, Action
- Price: Free with in-app purchases
- Age rating: 9+
- Requires: iOS 17.0 · 115 MB
- Languages: American English, French (France), German (Germany), Italian, Japanese, Korean, European Portuguese, Russian, Chinese (Simplified, China), European Spanish and 3 more
- Released: 2026-09-02
- Data updated: 2026-09-08
- User reviews in markdown: https://appshunter.io/ios/app/grey-day-virus/id6801502568/reviews.md

## What is GREY DAY?

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.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Planck 136,400 (+30% Bonus) | $99.99 | one-time |
| Planck 11,100 (+10% Bonus) | $9.99 | one-time |
| Planck 23,200 (+15% Bonus) | $19.99 | one-time |
| Planck 61,600 (+20% Bonus) | $49.99 | one-time |
| Planck 1,000 | $0.99 | one-time |
| Planck 2,100 | $1.99 | one-time |



## Version history (last 1 release)

### 1.0.0 — 2026-09-02

No release notes.

## More apps by HOKWANG LEE

- [GREY DAY](https://appshunter.io/ios/app/grey-day/id6770797698)

All apps by HOKWANG LEE: https://appshunter.io/developer/1896763756

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-08.*