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A one-time coachmark overlay walks a new player through the lobby and their first game board: a light dimmed layer draws one tail-pointed hint bubble at a time, advancing on a tap anywhere and removing itself for good after the last hint. Two independent series (lobby: settings/stats/new game; game: header/pass-exchange/hints/shuffle/rack), gated by a per-device persisted flag and marked done only after the last hint, so an interrupted run replays from the start. A deep-link into Settings -> Friends still triggers the lobby series on the first trip back to the lobby. Targets carry a data-coach attribute, so one positioning engine anchors the bubble in both portrait and landscape, re-measuring each frame until the geometry settles (route slide, hidden-banner reflow, fonts). The promo banner hides while the overlay is up (app.coachActive); a hidden DebugPanel "Reset visited" control replays the walk-through. Off by default in the mock build so the Playwright smoke is unaffected; ?coach forces it on for the dedicated e2e. Pure geometry (step lists, nextVisibleStep, placeBubble) in lib/coachmark.ts (unit-tested); Coachmark.svelte renders. Docs: FUNCTIONAL(+ru) onboarding story, UI_DESIGN coachmark section.