Once you have gotten bored with traditional sudokus , you can go looking for the innumerable variants : some overlap multiple grids ; others replace square subgrids with other structures ; still others introduce additional constraints 如果你開始覺得標(biāo)準(zhǔn)數(shù)獨(dú)無聊了,還可以試試數(shù)都數(shù)不完的變種數(shù)獨(dú),有些游戲把好幾個(gè)數(shù)盤疊在一起;有些用別的結(jié)構(gòu)換掉方形的宮;還有一些加入更多的限制條件。