I don't know if there's an available app or perhaps a terminal command, but I'd like to forcibly shut down a specific application at a specific time, without the option to cancel.
I'd like it so I can choose the time.
To make a long story short, there's a game that's incredibly addicting and if I don't force quit it, I can totally see myself getting lost in it for extra hours.
I'd rather just have the application quit, regardless of where I am in the game, so I make sure to follow through on my allotted time period for playing.
There's something similar, but not entirely applicable here (The info here could help in forming an answer): How can I forcibly shut down my Mac at an appointed time?