I customized all of mine:
'arcade\.php$' => 'games'
'arcade\.php\?&act=Arcade$' => 'games'
'arcade\.php\?do=play&gameid=(\d+)$' => 'games/$1'
'arcade\.php\?&act=Arcade&do=play&gameid=(\d+)$' => 'games/$1'
'arcade\.php\?act=Arcade&do=play&gameid=(\d+)$' => 'games/$1'
'arcade\.php\?&do=play&gameid=(\d+)$' => 'games/$1'
'arcade\.php\?do=play&gameid=(\d+)$' => 'games/$1'
'arcade\.php\?&do=play&gameid=(\d+)$' => 'games/$1'
'arcade\.php\?do=stats&gameid=(\d+)$' => 'games/highscores/$1'
'arcade\.php\?&act=Arcade&do=stats&gameid=(\d+)$' => 'games/highscores/$1'
'arcade\.php\?&act=Arcade&module=report&user=(\d+) $' => 'games/user/$1'
'arcade\.php\?&act=Arcade&do=viewtournaments$' => 'games/tournaments'
'arcade\.php\?&act=Arcade&do=viewtourney&tid=(\d+) $' => 'games/tournaments/$1'
'arcade\.php\?&do=viewtourney&tid=(\d+)$' => 'games/tournaments/$1.html'
'arcade\.php\?&act=Arcade&module=favorites&gameid =(\d+)$' => 'games/favs/$1'
'arcade\.php\?&act=Arcade&cat=(\d+)$' => 'games/cat/$1'
'arcade\.php\?&act=Arcade&cat=(\d+)&st=(\d+)$' => 'games/category/$1/page/$2'
'arcade\.php\?&act=Arcade&module=report$' => 'games/report'
'arcade\.php\?&act=Arcade&module=settings$' => 'games/settings'
'arcade\.php\?&act=Arcade&module=modcp$' => 'games/mod'
'arcade\.php\?&do=viewtourneyend$' => 'games/tournament/end'
'arcade\.php\?&do=viewtournaments$' => 'games/view/tournaments'
'arcade\.php\?&act=Arcade&do=createtourney$' => 'games/tournaments/create'
'arcade\.php\?&act=Arcade&module=league$' => 'games/league'
'arcade\.php\?&act=Arcade&module=favorites&gameid= (\d+)$' => 'games/fav/add/$1'
'arcade\.php\?&act=Arcade&module=favorites$' => 'games/favs'
Have fun