If you play games on the internet at work, it will show up in the browsing history and on the proxy server. To play games on the internet without being detected, use Google.
To play Atari Breakout, Google “Atari Breakout” (without quotes), then click on Google Images. You’ll then get to play the classic Atari Breakout game and the proxy server will only know that you’ve used Google Images, which is work friendly.
You can also play Pacman, by typing “pacman” (without quotes) into Google Search, or Google’s Zerg Rush game, by typing “zerg rush” (without quotes) into Google search.