Microscope — free browser game

Microscope is a real-time classification game played under a circular Petri dish. About 16 microbes drift around with Brownian motion (random curving paths). The 'Specimen' panel above the lens shows two attributes of the wanted microbe: its color (cyan, magenta, or lime) and its shape (round cell, rod bacterium, or tailed — flagellated). That gives 3×3=9 distinct types, with one or several of the wanted type present in the dish at any moment. Click a matching microbe and you score +1, the microbe blooms with a soft glow as it's 'examined', a fresh one spawns elsewhere in the dish, and a **new target** is picked — so don't lock onto one type for long, keep your eye on the current spec. Click a mismatch and you lose a point (floor: 0) with a half-second red flash penalty: spamming clicks burns your score down. You have 60 seconds; every 5 successful hits the microbes accelerate a little so by the late game you have to commit to the closest matching specimen quickly. When the timer ends your local best is saved and the overlay reopens. Tip: filter by color first (three are clearly distinguishable), then narrow by shape; when the target changes, pause for a heartbeat and look at the big reference in the panel so you don't reflex-click the previous target.