But I still think the roulette table could be a nice map.
Territories
Each number and outside chances is their own territory
Attack
You can attack next to and direct to, EG, not diagonal.
0 can attack every outside-chance. (and i willl not have dubbel-zero, i think 1 zero is enough)
Bonuses
Controll 3 co-working outside chances and get 1 army added on every number you own that works with all these three numbers.
