Only the current version so far — new entries appear as the game ships updates.
Fortiva Merge features three zones—Ice, Grassland, and Volcano—with progressively increasing enemy waves; destroy them to defend your stronghold and earn Gems. You start with one free artillery unit, and subsequent units cost 20 Gems each. Merge two units of the same level to upgrade them, boosting their power up to a maximum of level 3. Your stronghold loses health whenever enemies reach it. Gems can also be used to purchase items such as healing, Explosive Cannons (to wipe out all enemies), and Meteors (to blast away enemies along their path).