You could skip the coins and just have the unity app spit out time limited guest passwords for a network portal login, like a hotel does. I mean does openwrt support that?
It would be easy to add this to OpenWrt I think. I wanted to use coins since they're physical objects, and I also wanted to educate on what money is, how to use money, and earn money.
Funny anecdote happened one week ago, when child got back from school and said "Hey dad, look what I've got". He had 100-dollar bill in his hand, I'm not even kidding. He said "I traded some Pokemon cards at school"...
