The Clockwork Automaton
The automaton's face is built on nine action units from the Facial Action Coding System (FACS), the system animators, character artists and psychologists use to describe faces: inner and outer brow raisers, brow lowerer, upper lid raiser, lid tightener, lip corner puller and depressor, lip stretcher and jaw drop.
It shows one of twelve expressions. Several differ by a single unit: Grief and Doubt by the inner brows, Wonder and Surprise by the upper lids, Anger and Rage by the upper lids too. Seeing the difference is easy; saying it precisely under time pressure is the game.
Arvolve is a character art studio; its founder sculpts FACS blendshapes for film characters. The expressions here follow FACS unit combinations rather than cartoon shorthand, so a raised inner brow means what it means on a real face.
The face, the gear train, the masks, the chimes and the hallmarks. Four difficulty levels. Runs offline in your browser.