Dunno if this is the right place but..
Just bought Nightstand for iPhone. Really like the maths question thing (I browsed through app store specifically looking for an app that did something similar). However I think half the time I could subconciously turn it off still by randomly pressing a button. Could you make it so that you have to enter the answer? So in the settings, have "Maths Puzzle ON/OFF" and if ON, then select "Multichoice ON/OFF". And if Multichoice is OFF then make it so you have to type in the answer.