The first game that I styled for my Javascript arcade is a live clock. While this isn't per-say a game, it does display a live ticking clock. Simply, a user should just observe the clock to get the full benefit of the game!
The second game in my Javascript arcade, is a flex panel. While this is also not a traditional game, a user can interact with the site by clicking on the photos. When the panels are lined up, it creates a word, but when they are expanded out, you are able to see individual phrases!