Defenders has the player place troops alongside a winding path that enemies march along, with the troops attacking the enemy monsters continuously without retaliation.

The two games have similar base gameplay mechanics, wherein the player places troops of different classes to defend their crystals against multiple waves of enemies advancing across the screen. A sequel, Crystal Defenders: Vanguard Storm, was released for iOS in 2009. It was re-released with graphical improvements for iOS as Crystal Defenders Plus in 2013. Under that name, the game was also released between 20 for Android, Xbox Live Arcade, WiiWare, and PlayStation 3 and PlayStation Portable via the PlayStation Store. It was adapted for iOS later that year as Square Enix's first game for the platform, and renamed Crystal Defenders. The first game in the series is Crystal Guardians, which was released in three parts for Japanese mobile phones in 2008.

The games feature a selection of characters sporting Final Fantasy-based character classes, and play out tower defense scenarios against recurring series of monsters. The games use the setting of Ivalice and design elements from Final Fantasy Tactics A2: Grimoire of the Rift, forming part of the wider Final Fantasy franchise. Mobile phone, iOS, Android, iPod, Xbox 360, PlayStation 3, Wii, PlayStation PortableĬrystal Defenders is a set of two tower defense video games developed and published by Square Enix.

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