This is the first attempt to create the new difficulty system (which was requested by the community)
The two requirements of the new system are:
1. The difficulty is not too steep even for the only one player.
Until now the difficulty wasn't scaled accordingly to the player number.
It was too hard to progress through waves if there was only one player in the game.
The new formula significantly decreases the difficulty for 1 or 2 or 3 players playing.
The difficulty for 4 players stays as it was before.
2. The realism of the game is still preserved:
When the player joins, your chances against the horde increase.
When the player leaves you will have more trouble in the next wave than before.
If you want to reach the highest wave it's wise to gather 3 skilled archers at your side than to try defense on your own. :)