Curve Fever 3
Curve Fever 3 is another name for CurveFever.io.
It was released in September 2016.
The game was famous for the knock-out-mode, and its different kinds of "curves", for example: snake, robot, drill, squid, firefly, lizard and ghost, just to name a couple of many more.
Also the walls were open, but you could close them with an item.
the end of curve fever 3
Because of low numbers of players the game was shut down by 1st June 2018.