Historical clue formulations

• Hidden feature in a video game — 2024-12-10
• Bonus feature, of a sort — 2020-08-07
• Hidden DVD feature ... which can be found, literally, in the answers to the starred clues — 2013-03-31
• Item sought in the spring — 2007-08-09
• Item that's often hidden — 1999-07-11
• Hunter's object — 1995-12-23
• Hunter's quest — 1994-10-22