Here is a very useful addon that introduces a time bomb. Explosives are very similar to normal TNT, but here they include a timer and all sorts of wires. Activate all of the new bomb using the red stone.  Each device has its own timer: 70 seconds, 100 seconds and 140 seconds. Display time on the display changes every 10 seconds, so don't think that the countdown stopped. These improved TNT is not afraid of fire and lava. If You change your mind to detonate a bomb and want it to deactivate, then use the scissors and cut the right wire as in any Thriller. It is actually very simple and requires no long reflection. Off an explosive device, it becomes unsuitable for further use, so it can be safely discarded.