Thats fun too. function foo(x,y,num){ for(i=y; i<y+3 && i<10; i++){ for(w=x; w<x+3 && w<10; w++){ if(grid[i*10+w] == num) return tr

Thats fun too. function foo(x,y,num){ for(i=y; i<y+3 && i<10; i++){ for(w=x; w<x+3 && w<10; w++){ if(grid[i*10+w] == num) return true } } return false; } https://jsfiddle.net/gaby_de_wilde/ycx159kg/1/ https://jsfiddle.net/gaby_de_wilde/ycx159kg/1/