Math puzzle - More or Less

Challenge yourself with this math puzzle game: if you like maths, this game is for you. Goal of the game is to insert numbers from 1 to 9 - without repetitions - in the blue cells in a way that, numbers must be higher or lower than neigbouring cell according to the symbol (more or less). Choose the blue cell where you want to insert the number through the number pad and then touch Enter. Touch and hold icons for:
The first one catches the screenshot and saves it
The second one deletes only the green cells
The third one gives the solution
The fourth one creates another combination