[scottcanoni]

I am a kid again. Where do I insert the quarter? :)

[sprayk]

You can send them a bunch of quarters via https://archive.org/donate/

[stefantalpalaru]

5 - insert coin

1 - one player

arrows - move around

<ctrl>, <alt>, <space> - action buttons

[adam12]

There is an insert coin menu to the top left of the page. Press insert coin and then player 1 or player2.

[damon_c]

If you hit TAB it brings up a menu in which there is a list of all the keyboard possibilities.