I was so excited to receive this for my 15 month daughter. But sadly not a single one of the 4 pens it comes with will open in order to fill them with water. I tried opening them until I started to get blisters on my hands then finally gave up. The lids just don’t come off. VERY DISAPPOINTED!!! #RankBoosterReview #Sponsored #PipigoMagicWaterDoodleMat