Keep a student in rotation when needed

An optional Undo action lets teachers cancel an unanswered selection while keeping the student's turn available. New teacher remote codes are shorter to enter.

• Enable Undo in teaching defaults or a session when skips count as a turn.
• Return a selected card or labeled gumball without recording an answer or skip.
• Pair new remotes with six-character codes; existing eight-character codes continue to work.