Well, I'm surprised this didn't come up in searches here, because I'd imagine the Cantr RP crowd probably knows of this little gem of a browser game. I'm just getting into it myself ,but it's rather unique and quite different, and also slow-paced like Cantr is overall.
Patience is a huge factor in doing well apparently.
It's one part "Myst" puzzles, one part "Story RP, and one part Pokemon critter-trainer. Very intereating even to just dabble in for a week t osee if you like it or not.
This game is like no other game you've seen before, so don't assume you will figure it out, please read this short startup guide, it will help you a lot.
This is a multiplayer adventure game, you will find here creature fights, amazing places, secret areas, puzzles to solve, alliance collaborative play, a story that changes based on your decisions , magic spells and much much more.... but each feature unlocks as you go deeper in the game and discover them,
for now.. read on...
The generic link for folks to go check out: http://magicduel.com
The "referred by me so I get a teensy little bonus link: http://magicduel.com/register/register.php?refererID=208870