By Justin DavisIGN has partnered with SMG Studio & Soap Creative to give gamers OTTTD for iPhone, iPod touch and iPad free-of-charge! All copies of the excellent tower defense game are available on a first-come, first-serve basis, so be sure to visit OTTTD - IGN's Free Game of the Month - IGN to grab your free copy ASAP.

OTTTD, short for over the top tower defense (duh!) offers up a fresh spin on the ever-popular tower defense genre. All of the requisite tower defense strategic depth is present, mixed together with a complex and fun hero system. The game's recent gigantic 1.2 update added an Endless Mode, more campaign levels, new enemies, new items, and plenty more, so there's no better time to jump in than now.

This promotion is open in 44 total countries (full list below). No IGN registration or IGN Prime account is required.

IGN's Free Game of the Month: OTTTD - IGN