We love time travel stories at Big Download. However, they can also give us a headache when we think about them too much. Seriously, the whole "grandfather paradox" dealie keeps us up at nights. So when word got out of a new indie RTS game was being revealed at GDC this week, we decided to stock up on Tylenol.

The game is called Achron (not to be confused with the classic PC strategy game Archon) and its developers at Hazardous Software have offered up a YouTube video showing how the game uses time travel in its RTS gameplay. Clearly the graphics need some work but the gameplay ideas behind it (making units and then sending them back in time to go after enemies before the units were made) are pretty cool. Until you start thinking about all of the causality issues . . . then we reach for the pills. You can check out more videos at the game's official web site.