For the first time ever, Namco Bandai has released a completely free version of PAC-MAN, and it's exclusively available on Google Play. PAC-MAN + Tournaments offers a full-featured free-to-play version of the original game, along with a new "tournaments" feature, which lets you play online against others on new stages each week. The game also has new never before seen mazes available for purchase, along with online leaderboards and achievements.
Namco Bandai also says that it plans on releasing Google Play-exclusive downloadable content in the future as well. The game is of course free to download in the Play Store, so if you're looking to take a trip down memory lane head to the link at the top of this post.