of course, there's always

C-x C-c


M-x kill-emacs


M-x save-buffers-kill-emacs

also, M-!, followed by the "kill" shell command, above.

or, M-x shell, and again, use the aforementioned shell command, this time in the shell buffer that you just created.

But wouldn't you rather settle down to a nice game of M-x tetris?