A jack repeats note starts in the same column at short intervals. In the diagram, every tap returns to column 2.

Open the diagram to view the full-size image. These are original timelines, not screenshots of a real map. Column numbers are not keyboard bindings. The example is illustrative rather than a test of the entire-chart classifier.

The analyzer examines consecutive starts within each column, their short intervals, the share of participating notes, and repeated-note runs. Notes in other columns can coexist with a jack run.

.style jack
.jack

Use either form as an active player. The shared room’s future selections use the preference; already visible queue entries stay in place. Use .style or .map to inspect the current Mania chart and .pool for active filters.

A fast single-note sequence can contribute to both Jack and Stream scores in the broad v1 classifier. A Jack label is not a promise that the entire chart stays in one column.

When strict fresh choices run out, style fallback can broaden the selection while keeping the active eligibility boundaries. Common spelling aliases remain supported; see style syntax.

See the visual pattern atlas, the command reference, practical style examples, and style selection.

The illustration explains the pattern, not an automatic admission test. Current native catalogs require a style score plus sustained/prominent feature evidence; a short passage or isolated event need not qualify the whole chart. See style selection and fallback for combinations and fresh-map tiers.