Gems of War
Another game unfortunately ruined by liberal use of IAP.
Puzzle Quest was a satisfying and exciting title when it first came out several years ago, and it set a precedent for the gem-matching, spellcasting fun of modern titles like Puzzle and Dragons or many of the other similar games on the App Store. Gems of War is the newest title from the creators of Puzzle Quest, and while it's rife with fantastic art and addictive gameplay, the fee to entry is ridiculously high.
Gems of War follows the same structure as several other titles you're undoubtedly familiar with: match the colored gems to launch an offensive on enemy targets, using stamina that depletes with each game that you play. If you lose a match and you run out of energy to use for the next round, it's game over. You can wait for them to refill, but you can make things quicker by spending real-world cash.
You've got your own crew of fighters with special attributes and stats, as well as different attacks that they can use to fell enemies. Using a combination of your allies' special abilities, you'll need to play strategically in order to conquer each level, especially as the AI rises in difficulty as you progress.
There's a solid game here with Gems of War, but you probably won't see it because of the massive amount of paywalls much of the content is hidden behind. You're forced to pay gold for each and every match you complete, which is won by emerging victorious every time you head into battle. You can also get it from helping out towns in bondage, but in order to save the towns, you've got to spend a hefty amount of gold first. It's a frustrating cycle, and beyond that you've still got to worry about stamina and the rest of the frustrating game mechanics that accompany it.
Gems of War is a competent and interesting matching game with exciting battles, but most players won't have the patience or desire to spend the extra cash required to flourish in the ways the game wants you to. There are plenty of better free-to-play titles out there with fewer frustrations, so opt for one of those if you're looking for a good puzzler.