Gems of War 

A Free Puzzle and RPG Hybrid

Gems of War is a free-to-play puzzle RPG, developed by Infinity Plus 2 and published by 505 Games. It is considered a spiritual successor to Puzzle Quest and combines classic 'match 3' puzzle gameplay with role-playing elements. Players battle enemies via a puzzle board, where matching gems and skulls serves to power up spells and deal damage to opponents. There are 20 different kingdoms to explore and capture, and the game's card collection features add more depth than with most similar 'gem' games on the market.