Dark Star

There are few RPG like this. Find an old Java based keypad phone and download and play this you'll know what I mean. It's got dungeons, dragons, earthworm monsters, vampires, a villain, a love story, a huge adventure, and the ability to have you sit and play it for hours. Android or iOS or windows phone won't give you the hype or vibe of playing such retro games through Java Simulators, but you can give it a try.