Fieldrunners is a Tower Defense game that has enjoyed some success on the iPhone, and is gearing up to be at the vanguard of titles launching on Sony's PSP Minis service. Minis will see the PSP go head to head with Apple's iPhone, providing cheap, downloadable, bite-sized titles in a similar manner to the App Store. According to Fieldrunners dev Subatomic Studios, this rivalry could be quite close, since porting games between the two systems is remarkably easy.

According to Touch Arcade, the transition from iPhone to PSP was smoother and simpler than had initially been expected. Fieldrunners on the PSPgo will launch with two brand new levels, although iPhone users can download the new stages for $0.99 per map. Firsthand accounts from those who have seen the game running on the PSP indicate that the port was a great success.

Fieldrunners is one of several iPhone games heading to PSP Minis, and the ease of transition could mean that we see many more in future. If things go how I'm hoping, then the PSP will serve as a way to get at many great iPhone games without buying one of Apple's oh-so trendy products. I'm very excited about that, and hope that PSP Minis turns out to be as good as I expect. 

Hit the jump for the Fieldrunners PSP trailer.