Dragon Quest IV was the final game of the series to be released for the Famicom, back in 1990. Since then, it's been released in Japan on the Playstation, and in all territories again for the Nintendo DS, receiving the typical graphical and other enhancements along the way. The game's humble origins but number of remakes and ports would seem to make it a prime candidate for a new mobile release, and that's just what has just happened.
The game tracks closely to the most recent remake, and becomes the second Dragon Quest game released for mobile devices, after VIII. The game is listing in the States at $14.99 for both iOS and Android platforms.
Also, check out that website. So many images.
Source:
Dragon Quest IV Official Site