Namco Bandai brought some of their 80s arcade games to iPhone. You can get Xevious, Phozon, Motos, and Tower of Druaga now. And just like actual arcade machines, you need to put in credits to play them.
Each day, you get one free play. After that, ten credits cost 80 yen ($1). Sure, each play is less than an actual arcade game (those are at least 100 yen), but 10 cents per Tower of Druaga credit seems a bit steep.
Players can compete for top scores on leaderboards and share replays online. You can download the Namco Arcade app here.