To design an attractive interface, you can use the image of a bomb and an image of an explosion. Make the explosion image invisible at startup as it will show up only if the user fail to defuse the bomb. You also need to insert two command buttons, label one of them as Confirm and the other one as Reset. Besides, insert three text boxes to be use as password panel. Insert a timer control and program it so that it can start the countdown. You can set the timer's interval to 1000 so that each countdown is one second or you can set shorter interval. The sub procedure for the Timer to start countdown is as follow: - See more at: http://www.vbtutor.net/vb_sample/timebomb.htm#sthash.HYkE0aZd.dpuf