Barrow Crawl

Barrow Crawl is a solo Tabletop Role Playing Game where you play a party of adventurers in a dungeon, killing monsters, getting treasure, and leveling up. The game is driven by an app which acts as your dungeon master. 

The rules are free, you can download them from this page.

You can get the Android app here:

https://play.google.com/store/apps/details?id=net.erickveil.barrowcrawl