I have seen that one before, but never found rules to it.
All the other Keno boards have holes for ball numbers. So this one can obviously not played by normal Keno rules, where you have to pot a ball into it‘s matching numbered hole. I can only guess, if both players have a ball colour and try to form a poker hand with their ball set. Thats how I would play it at least.
Let‘s see if anyone can provide more information on this one
