Reversed mode is a mode where all colours are reversed and Rrats spawn.
You can go back into the portal again to return to normal.
Also, if you take a slime into the portal, then throw it at the reversed version of itself, it creates a Antimatter-matter explosion.
An antimatter-matter explosion, or AM-M-e is a huge explosion, 7.5 times the size of a Boom Slime's. It is caused by anything from Reversed mode touching the non-reversed version of itself, such as a a Rrat eating a Tarr or a Tarr eating a Rrat.
- Don't really know what the point of this is, I just thought it looked cool.