I'm wondering if maybe the colors on the rat tiles could maybe be a little paler so they could be more easily differentiated.
I was thinking of adding a skull and crossbones on a bottle (poison!) icon to the tile to differentiate it, but that would mean I'll have to draw it. Urgh.
I'm also curious if 6 tiles might be a little too many.
It probably is. Those who only want 2 tiles can just make 2 tiles from the sheet. Those who want all 6 can make all 6. Just think of the other 4 as "extras".
However, I don't think it has to be that way.
The thing about german games is that it doesn't reward the current leader. On the contrary, it punishes the leader and allows those who are behind to catch up. Hence nerfs like these tiles need some way of "get out of jail" or it will severely unbalance the game somewhat and rewards the leader greatly with no chance for those lagging behind to catch up.
Carcassonne is a game about luck in tile-drawing and strategy in tile-laying and meeple-deployment. A good "get out of jail" would be to use all of those elements to remain true to the game. Hence, using the tower or dragon (existing game features) to free ones knight from a besieged city seems like a good idea to me game-wise, but again, those actions are up to the players - do they want to free their plague-infested knight with a tower piece or do they want to do something else? It opens up avenues and strategies where before there were none. Also, keeping the dragon and tower rules intact without any exceptions makes it easy to remember and easy to play with and keeps things simple - and simplicity is another hallmark of a german game.
Likewise, with the pig farm. Ensuring the rules for it stays the same with no exceptions makes things simple.
Of course, different players should be free to play with their own version of the house-rules if they wish, but some of the principles behind the expansions that we are striving for here at CarcCentral are to:
1. keep things in theme
2. keep it simple
3. keep it balanced
4. increase the strategy available
5. increase the fun level of the game