Plants Vs Zombies is definitely a good fun arcade game but the multiplayer is local only (co-op in adventure or vs mode). Raskulls is a multiplayer based game (other than the mega-quest storyline) and there's still some players online or there's good ol'
4 player local.
You can keep coming back to it. They run weekly quickplay tournaments where the player with the most xp in 30 mins win additional chips etc. Previously they were doing spring tournamants & they just put out another free update with additional acheivements
for the summer tournaments which you can play on tuesdays & saturdays.