text: Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
  ### Context:
  CREATE TABLE table_name_91 (required_os VARCHAR, type VARCHAR)
  ### Question:
  What operating system was needed for 2D games?
  ### Answer:
  SELECT required_os FROM table_name_91 WHERE type = "2d"