Right now the only way to do so would be in your SQL database and I have NO idea how that would affect things.
For example, you could 0 out all the scores there, but unless you totally removed the scores from both the xf_arcade_game and xf_arcade_game_play records, I think it would cause issues.
Hopefully the devs have a better idea than me!
I found the solution. This is a 2 step process.
Empty (not drop) the following
xf_arcade_vote
xf_arcade_session
xf_arcade_game_play
Now comes the more time consuming step (cause I personally didn't know a command that could do this).
Inside
xf_arcade_game you'll need to edit each game (in phpMyAdmin it is 1 line per game install) and clear out the following
highscore
highscore_user_id
highscore_username
highscore_date
play_count
vote_up
vote_down
This re-sets everything back to default as if the game has been freshly installed.
FYI: Next version update
REALLY... Do not ignore this....
REALLY needs to either self empty
xf_arcade_session and
xf_arcade_game_play or restrict how much data is kept.
Those tables were larger than life and I only have 23 games installed. Which isn't really many except that the arcade keeps records of
EVERY game played
for all time So if X user played Y games Z many times, it kept that record forever. Multiply it by X users who use the arcade and you'll have just an idea how
BIG that part of the database can get.
My site is now running FASTER having cleared things.