chromeos-apk
Run Android Apps in Chrome OS OR Chrome in OS X, Linux and Windows
...Then download an open source game, like 2048.APK Game by Uberspot and load it as an unpacked extension. Go to chrome://apps and launch it there, ignore warnings. Install a sample Android app from the Chrome Store to get the runtime. Test out that app, make sure it runs on your hardware. Ubuntu might need sudo apt-get install lib32stdc++6. Install Node.js and install the tool (might need a sudo prefix). With Chrome 38+ you can now side load as many applications as you want. If you have older apps that were created using chromeos-apk tool then re-convert them or remove the "key" option from manifest.json.