一年级打印版数独题

SudokuPuzzles:EasyThemodernversionofSudokuwasinventedin1979byHowardGarnsinUSA(whereitwascalled`NumberPlace').ItbecamereallypopularinJapaninthe1980sandintheUKsincelate2004.Itisnowquicklyspreadingworldwide.ThewordSudokuisanabbreviationofaphrasewhichmeans“thedigitsmustoccuronlyonce”.TheaimofaSudokupuzzleistofillinthegridsothateachrow,eachcolumnandeachboxcontainsallthenumbersfrom1to9.Usuallythegridis9by9,usingthenumbersfrom1to9,buttheeasiergridsaresmaller,usingnumbersfrom1to4or1to6.Simpleeh!Ofcoursenot!Sometimesitiseasybutoftenitcanbefiendishlydifficult.Butit'sfuntolearnstrategiesforyourselfbyjusthavingago!Thereareseverallevelsofdifficultyforyoutotry:1.Easy.A4by4gridtostartoff,leadingtoa6by6grid.2.Medium.9by9grids,butwithplentyofnumbersalreadyinplaceandsomehelpfulclues.3.Hard.Thehardpuzzleshavelessnumbersalreadyinplaceandrequiremorestrategiestobeused.4.FiendishandDemonlyHeadteacher.Onlyforexperts.Ifyoucan’tdothemtryaskingyourHeadteacher!(Theymightbecomesoengrossedtheyforgetaboutthedetentionyougot!).ThissectionistheEasysection–20puzzlesGoodluck!MathSphereSudokuFillinthepuzzlesothateveryrowacross,everycolumndownandevery2by2boxcontainsthenumbers1to4.EasierPuzzle13234EasierPuzzle22342:1.Finda3beneatha2.:1.Findthe1inthelastcolumn:1.Lookfora3onthetoprow.:1.Lookfora4inthefirstcolumn.