Tomkin Press' sci-fi sister RPG to Shawn Tomkin's rightfully very popular Ironsworn is a hit. The Kickstarter community is eager to back to solo RPG, which has options for co-op and guided play.
DriveThruRPG has kindly pulled some data from their vast marketplace of RPG goodness, and we can now see which RPG titles have come out top.
Delve has been called the dungeon crawling supplement for Ironsworn but it adds more dangerous locations than just underground tunnels.
Geek Native has popped all the runners and riders into a wee database so you can quickly navigate between categories.