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There was also Lego "Quatro", double the size of Duplo, for very young toddlers. Only sold from 2004–2006, but still in high demand on the used market. Interlo

• jacquesm 5y ago
  Oh cool, never knew about that one. I do have one more to add but it's mostly technics warmed over, which is 'Znap', clearly aimed at the same market as 'Knex', which Lego at some point saw as a competitor. Since then they've come their senses, the Znap line was ugly and highly impopular, leading to being discontinued after only a year.