You will never see it. You can only hear it.

Welcome to the inspection line of a cannery. The food packed here will end up on somebody's table. Cans come down the belt; you tap each one with an inspection rod, listen to what comes back, and knock the spoiled ones into the chute.

The last gate before the food reaches anyone

What is sealed inside each can is food. Let bacteria grow and gas swells the can; let them turn acid and the contents sour. None of it is visible from the outside. That is why the tap test - striking a can and listening to it - is still used in food factory quality control. What this game simulates is the ear on that line.

Sound is the only clue

Every can on the belt looks exactly the same, whatever is wrong inside it. No bulging lid, no dent, no rust - nothing is drawn. Looking will not help you. You have to tap it and listen.

A good can rings clean. A bad one sits a few cents off that pitch - and only the pitch differs. The decay, the strike noise, the timbre are identical down to the sample. There is no "it just sounded off" to fall back on.

Tap here, reject there

The zone where you can tap and the zone where you can reject are different places. You tap on the right, listen, and have a few seconds while the can travels before you must commit on the left. That gap is your thinking time. The line does not wait.

The line never stops

No stages. One run, and the belt keeps getting faster while the cans crowd closer together. Three misses ends the shift. Achievements come from how fast you pull a bad can, how far you push the belt, and what you score before the third miss.

The defect catalog

Every anomaly you successfully reject is logged. Ten real cannery defects - hard swell, flipper, flat sour and the rest - each with reference art and notes on what actually went wrong inside the can. Fill the catalog and Hard Mode appears, where the pitch differences shrink further.

Features

• Food factory quality control as a pure listening game
  
• The visuals give away nothing, by design
  
• Ten tap sounds built from real canning defects, with an in-game catalog
  
• 27 achievements, most of them on reaction time and belt speed
  
• Keyboard, mouse and gamepad, all fully rebindable
  
• Eleven languages

Headphones or earbuds are strongly recommended. On speakers, the differences you are supposed to hear get lost in the room.