Historical clue formulations

• Block-stacking game — 2023-11-14
• Game of manual dexterity — 2022-06-11
• Tower-building game — 2019-06-25
• Game with a stack of blocks — 2016-08-29
• With 18-Down, structure that gets less stable with time — 2015-04-05
• Game for players with steady hands — 2013-04-21
• Game whose name is derived from Swahili — 2011-06-26
• Popular block game requiring nimble fingers — 2008-06-18
• Popular block game — 2007-02-24