Join two sites. Shape a little loop. Match the five readings to finish each glass keepsake.
Click two numbered sites to join them. Their distance is the loop length: site 1 to site 4 makes a length-3 loop.
Make the requested number of loops. Each site holds one clamp. Arcs may sit inside one another; interleaving arcs (1–4 and 2–5) cross and cannot be joined.
Length adds every loop’s length, including inner loops. Nested pairs counts each pair with one loop fully inside the other. A, B, C count the loops spanning each vertical checkpoint beam. Match all five current / target readings.
Click a loop chip to remove it. Undo and nudges are free. Keyboard: Left/Right chooses a site, Enter or Space selects it, Escape clears a pending site, U undoes. Tab also reaches every control.
Research inspiration: FIND, reported by Harvard Wyss on November 5, 2026, uses DNA nanoswitches to study protein interactions. This puzzle invents its own loop rules and uses no research data or scientific predictions.