My friend Snyvie and I found this cool glitch while playing Pet Swarm Simulator.
To do the portal glitch you need to:
1- Have a full bag
2- Be or go into the event area
3- Collect something to get the bag full pop-up
4- Accept to teleport back to your nest
5- Go back through the portal
The other glitch in the video happens when you have the portal glitch. It is possible to use it to glitch into rocks which will push you under the map or like in the video a tree. However, it is also possible to get yourself half in the ground, and if you get this jumping will get you under the map.