Secret Code by is a free coded dingbats font with the feel of puzzle marks and notation pulled from a private system. The visible set mixes spare linear signs with odd, serifed figures, so the overall impression is less ornamental than cryptic - like indexing symbols, fragments of a cipher, or marks from an old workbook no one has fully decoded.
That makes this free font a natural fit for escape-room branding, mystery game graphics, zine covers, poster accents, and chapter openers where a few symbols can suggest secrecy without explaining themselves. It also works well in title cards, package labels, or small callout details, because the marks feel intentional and slightly strange even in short bursts.