my eggs got crack

I leave them at room temperature for about 10 minutes at least and then I cook them with cold water. In that way, the outside will warm little by little and you will have a good hardboiled egg ( or soft boiled if you take it out sooner). My grandma said that the time to took a hardboiled egg well done was to pray 3 Hail Mary´s from the time they started to boil. I think this is rather primitive , but I would say 3 to 4 minutes would do al well. Take care!

I normally add a bit of salt in the water and before i put the eggs in the water i take a needle and put it in. Just remember to remove the needle when the eggs are done. Hope that was helpfull.

I add a bit of salt and that keeps the eggs intact. Try that and see if it helps you. Good Luck!