Can i sit in the game??
Are those coins shops' items the same as the ones under sopping cart?
I'm not completely sure what you mean, but if I'm understanding correctly, yes, you get to the coin shop via the shopping cart icon.
Where do i get adventurer's silver sparkle?
I've never heard of this item before, sorry. Could you explain it better?
Where can i get level 20 equipments?
To the best of my knowledge, most, if not all, of the level 20 equipment was removed from the game back in December. The highest gear currently that I'm aware of is level 16; however, it has identical defense and so on as the older level 20 gear. So, you're not really missing out.
Some players do sell their older level 20 gear sometimes, though. Keep an eye out for that if you're interested in it. :)