Two challenges played against the live HRL engine. It relaxes the whole field from your moves in real time — can you out-think it?
Forty real handwritten digits. Click a digit to reveal its label — that becomes a seed. The engine relaxes the labels across a similarity graph from your seeds. Get all 40 framed correctly using as few reveals as you can. The engine's 5 blind seeds (one per class) land 39/40 — you pick the seeds; can you reach a perfect 40? Click a revealed digit again to hide it.
Two molecules, mirror images of one another — one R, one S. Which one is R? (Lowest priority H points back; trace Br→Cl→F — clockwise is R.) It's genuinely hard by eye — that's the point: handedness lives in the order-3 term, and the engine gets it every time. Spin them to help. Build a streak.
Every line is a rule between two nodes: = wants them the same colour, ≠ wants them different. Click a node to flip its colour. Satisfy every rule (line turns green) — but some puzzles are frustrated: no assignment satisfies them all (brute-force-proven), so aim for the best possible. Kin to the Frustrated Systems demo.