I had seen many well known members are using new tools like sand blocks, cylindrical draggable etc in their levels which we do not get in classical mekorama app. So where I can find them ?
Welcome @Abhishek Kujur! You can find what you're looking for in the MekoStudio thread in the Announcements forum. In fact, all the most important notes we have originate in that forum. Have fun!
I’ve been recently playing levels and have seen Metallic Stairs and Dirt Slopes, something that isn’t in the original game. How do you get these?
On your laptop/PC, open MekoStudio then click '3D Builder' on that page, it will show up a page ('studio') where you can make levels with ton of new blocks.