Historical clue formulations

• Puzzle toy solved in a record 3.47 seconds in 2018 — 2020-12-20
• *1980s hand-held puzzle craze — 2015-08-10
• Six-colored puzzle — 2008-10-07
• Six-faced puzzler — 2006-06-27
• Mental block? — 2000-06-02
• Early 80's fad — 1995-10-17