GREY DAY: VIRUS

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.