I haven't had the opportunity to help make all the crystals but I tried one out to make sure it would work. It hasn't even been twenty four hours and the crystals after forming perfectly! My son is excited and later today the other two are going to be started. Just make sure you boil that water :)My kiddo got a random, different brand, for Christmas and that one didn't work as planned and he was bummed. Honestly I will say I think it was my fault since I didn't boil the water long enough bit it looked my like fluffy crystals. Anyways with the mini explorer version I made sure the water was boiling extremely well.Update: I meant to update sooner but all three turned out perfectly. I made a small mistake on the first Crystal. Make sure that when you see the crystal start showing above the water to drain it. It does state that in the directions but I had misplaced them at the time. These were awesome and my son loved watching them grow and then if course enjoys then on display.