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Messenger is the first esolang I made, and it's the perfect blend of frustrating and frustrating. It operates on a 2D grid, and has support for concurrent IPs (or messages). Actually, you have to use messages, because otherwise the functions on the grid simply have nothing to do. And if that wasn't enough, you can't loop messages around the grid, since they get printed and then disappear.
I think you can pretty quickly figure out which of the five categories this esolang belongs to.
GitHub:
squareroot12621/
Esolang: Messenger