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I'll register on the game as soon as I get back home after Easter :P Playing on the mobile phone sucks. How much time per day a player is expected to spend on the game?

Its really up to you.
Its a dungeon crawl.

So some players grind a lot on Friday's when the new content comes out.

Some people run a few dungeons and battle a few times daily in the Arena.

Trying to stay away from the "you have to play daily" to more of a "play and enjoy this week's content or this month's event"

The web based game is just part of the gaming world we are building based around Thunk.

Happy easter!