Jennywenny: Found this on a wiki:

A video game, called Trigun: The Planet Gunsmoke, based on the Trigun manga, was in development for the PlayStation 2 system. It was unveiled in 2002 in Sega's 2002 GameJam video. The unveiling consisted of a 20 second clip from the game. The clip showed multiple characters from the Trigun series. Since its unveiling, no word on development had come out by its developer Red Entertainment or publisher Sega. Sega has issued a "no comment" on the current status of the game's development. As of 2011, no new comments from Sega have been made in relation to the video game, and it has likely been cancelled.

mrcrispy83: Closest you'll ever get is the Gungrave games, which at least had Nightow character designs.

Licurg: Never heard of them. I'll have to check them out.

mrcrispy83: http://hardcoregaming101.net/gungrave/gungrave.htm

It's a little surprising that you haven't heard of the series before, since while the games are low budget and a bit obscure the anime adaptation is pretty well known and popular on its own merits