| This model of mechanical games are a seedling source from 18 century's end Switzerland, latter develops in the US, and mathematics intelligence jigsaw puzzle which can carry forward in Japan, the Chinese named number is alone, it slights the law logic to be simple, the digital arrangement way is ever changing, but many pedagogues think the number to exercise brain's good method. Numeric keyboard: 1,2,3,4,5,6 functional keys, some 3 game rank may supply the choice: Simple, intermediate, high-level |
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