Leaderboard called "100 days performance score".
Score depend on items sold and its difficulty in the last 100 days.
The more items sold and the more they are difficult the more score you will get.
Detailed in game report will be added soon about this score performance.

Note: 100 days performance is not saved,every time you load a saved game the score will reset and will be calculated starting form the loaded game state.
this mean to get the max score you need to run your current game for 100 days.leaderboaard score will be updated only if you get higher score than the previuosly uploaded one.