s999 - random numbor sudoku

you have to put all 1 to 9 numbors on the game board
numbors are given under the game board randomly

when you use all numbors, new random numbors are given
and when you use all, one random numbor appear on gameboard

if there are only five block left on the game board,
one random numbor doesn't appear

first, touch block on game board that you want to put numbor
second, touch numbor block under game board that you want to put on board

rull is easy but play is difficult