It was only a matter of time before a game like this came out. After the release of the stellar Legend of Zelda: The Phantom Hourglass, it only seemed natural that another developer would follow Nintendo's lead and make a great dungeon hack that controls solely with the stylus. The Summon Night series garnered great praise on the Game Boy Advance, where it featured innovative side-scrolling combat almost more akin to a Street Fighter-type game or a platformer than a role-playing game. It comes as a surprise (but a welcome one) that the latest DS incarnation, Summon Night: Twin Age, takes the series in a completely different direction. It draws inspiration from The Phantom Hourglass, resulting in a fun (if bland) hack-and-slash.
As mentioned above, Summon Night: Twin Age is controlled entirely using the stylus. Tapping anywhere on the screen leads your character there, and tapping on an enemy will cause your character to attack. Both the left and right sides of the screen house customizable toolbars that let you cast spells, use items, and perform other tasks. It works very well, allowing you to quickly access anything you might need to take on the game's various baddies.