When players move to the next level, you need to use the LevelUp event. All our reports, that are built by levels, are based on this event, e.g. Currency balances by level, Player levels, etc. Also, if your project has in-game currency, using the LevelUp event you can send information about the current amount of in-game currency players have. This data allows to evaluate the average amount of in-game currency that players have on a particular level.