Dota Underlords is the sequel to Dota Auto Chess and is the first of the Dota games to be released on the iOS and Android platforms by Valve. This game puts you into a chess board-like arena where you put characters down by position, a quick battle ensures, then you repeat until you defeat all of the other enemies in the arena.
Your goal is to progress through tougher and tougher players to make it to the top of the charts, as well as to earn gold and to upgrade your character sufficiently. You can earn gold, master the use of positioning and alliances, and more on the way to becoming a consistent winner.
Source: N4G PC Dota Underlords: Walkthrough, Tips, Cheats, and Strategy Guide