Hi Max,
We're sorry to hear that you're having so much trouble removing the Ice-Toy's stopper!
Usually, twisting the stopper at the same time as you're pulling the stopper up (and out) will work, with just a little wiggling & persistence. It is very important to have clean, dry hands as you do this. Make sure the silicone is clean and dry, too!
A GF Pet Team member will be contacting you to provide additional assistance.
Thank you!
The GF Pet Team