Dr. Micro
ARCADE

Dr. Micro

Released in 1983 by legendary gaming publisher Sega, Dr. Micro is a fast-paced action ARCADE title that stood out from the crowded 1980s arcade landscape with its unique medical-themed setting. Unlike typical space shooter or beat ‘em up arcade games of the era, Dr. Micro casts players as the titular tiny scientist, who has been shrunk to microscopic size to enter the body of a critically ill patient and eliminate a wave of mutated, invasive pathogens. Across 7 progressively challenging levels, you’ll travel through different parts of the human body, starting from the oral cavity, moving down the esophagus, through the acidic stomach, winding intestinal tract, and finally to the bloodstream to reach the final boss: a giant, rapidly mutating influenza virus. Along the way, you’ll face swarms of hostile bacteria, viruses, and fungal spores, each with unique movement patterns and attack styles, while also avoiding accidental damage from the body’s own overactive immune cells that mistake

No download required
Save states supported
Works on mobile & desktop

The emulator loads after you press Start Game.

How to Play Dr. Micro

Move
WASD
ABAction
JK
XYShoulder
L;
STStart/Select
21

Save & Load States

  • F2Press F2 to save your current game state at any time.
  • F4Press F4 to load your last saved state.
  • F3Use F3 to switch between save slots.

Save states are stored locally in your browser. They persist across sessions but are cleared if you clear browser data.

Customize Controls

Click the gear icon on the emulator toolbar → "Controls" to remap keys.

Move
WASD
Action
JK|L;
System
2 Start1 Select
Save
F2SaveF4LoadF3Slot

Default layout for ARCADE. Remap in emulator settings.

About Dr. Micro

Dr. Micro is a classic ARCADE game you can play online for free in your browser. No download or installation is required — click "Play Now" to start instantly. Relive the experience of vintage console gaming with authentic gameplay, right in your browser on any device.

This title is part of the PLAYERETRO game collection, which features over 1000 classic titles across multiple systems. Use the keyboard controls shown above to move and interact. Save your progress with save states and enjoy Dr. Micro anytime, anywhere.

Play the iconic 1983 Sega arcade game Dr. Micro online for free at PLAYERETRO. Shrink down to fight mutated pathogens inside the human body, collect power-ups, and beat challenging bosses in this belo

Game Guide

Mastering Dr. Micro’s controls and level mechanics is key to beating all 7 levels and claiming a spot on the high score leaderboard. First, familiarize yourself with the core controls: use the 8-way joystick to move Dr. Micro across the screen, the A button to fire your default antibiotic projectile, and the B button to deploy your limited-use emergency disinfectant spray, which clears all on-screen enemies instantly. For the first two levels (Oral Cavity and Esophagus), prioritize collecting red penicillin power-ups whenever they spawn: these upgrade your projectiles to deal 3x regular damage and pierce through up to 3 enemies at once, making quick work of swarms of cavity bacteria. Avoid bumping into white roaming white blood cells at all costs: they are friendly to the patient, but will recognize you as a foreign object and drain 50% of your health bar on contact, with no way to damage them back. When you reach the third Stomach level, watch the rising acid meter at the bottom of the screen carefully. Acid levels rise every 20 seconds, and any contact with the acid will drain your health rapidly. A neon orange anti-acid buff spawns every 30 seconds on a random platform: grab it immediately to get 20 seconds of acid immunity, and try to stay on the highest available platforms while you wait for it to respawn. For boss fights, the first boss (Giant Cavity Bacteria) has a clear weak point: the glowing red pustule on its forehead. Ignore its roaming tooth minions and focus all fire on the pustule, and you can take it down in 12 regular shots or 4 penicillin shots. For the final Influenza Virus boss, save at least 2 disinfectant sprays and 1 purple serum invincibility buff for the fight. When it fires tracking virus projectiles, lure them into the side walls of the screen to make them explode, and when it activates its full-screen laser attack, tuck yourself into the two small recessed platforms at the very bottom of the screen to avoid taking damage. Collecting 5 emp