Taj Mahal, anyone?
Switzerland
Basel
Läckerli State
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BrenoK wrote:
...Why not 5, or even 6? ... I think it would definitely be playable...
Playable, sure. Enjoyable, not so sure. But why not give it a try? Lowering the number of roos seems to be a sensible thing. 
I have never played Billabong with more than 4, which in my opinion is the ideal player number. It's OK with 3, didn't like it as a 2-player game.