I'm currently exploring a product called Construct 2, which is a development environment in which you can create games that work in any web browser. Once I've looked at it a little further, I may write about it here. Especially as it's available for free in certain cases, so you can generate your own games for no cost.
In the mean time, the company behind Construct 2 also has an online arcade where you can play dozens of games that were created with its product. They're all free to play, and you need nothing more than a web browser.
To try them, head to https://www.scirra.com/arcade/top-addicting-games and see which one you like best.
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