Historical clue formulations

• Wikipedia's logo, e.g. — 2026-06-10
• Interlocking puzzle — 2022-08-16
• Fitting pastime? — 2018-06-30
• Puzzle type — 2011-06-16
• Piece project? — 2009-10-23
• Interlocking puzzle — 2008-10-20
• Christmas gift easily identifiable by shaking? — 2006-12-24
• Puzzle solved without pen or pencil — 2006-11-23
• Fitting activity — 2001-10-19
• Fitting work — 1995-12-17
• Picture of a Bavarian castle, sometimes — 1995-12-09
• Common card-table project — 1995-06-25
• Puzzle type — 1994-08-21