Develop game in Dart/HTML5 -

We have to write a game in Dart following general guidelines for a school project... First rule is we can take any game in Javascript and adapt it to Dart, and it should be an HTML5 based game. Second rule (very important): IT HAS TO BE NEW AND NOT FROM GITHUB!! We submit our project on github and the teacher will check if it was used before. It can be tic tac toe... tetris.. snakes or whatever comes to your imagination.