So two questions about this:

Can you gain L2 access from the single tactical puzzles, like you can L1 access. I'm not seeing any progress towards L2 so I'm guessing not.

Second question: If you were to buy the L2 access, can you invite others to your private game? Or does everyone have to buy the access?

Thanks for any help!

1. You cant unlock it, you have to pay.

2. yes you can invite other L1 level players

But note that unfortunately the L1 players can only play in 1 game at a time and thus your private game is the only game they can be playing in. They will be unable to join if they are currently playing in a different game.