Small Arms is a physics-based platform brawler released for the Xbox Live Arcade (XBLA) in 2006. It features 360-degree aiming and platforming mechanics similar to Super Smash Bros. or Power Stone.
Small Arms: A Fun and Challenging Xbox Live Arcade Game Small Arms -XBLA--Arcade--Jtag RGH-
For those with a JTAG (Joint Test Action Group) or RGH (Reset Glitch Hack) modded Xbox 360 console, Small Arms can be played with a few tweaks. These modifications allow users to run unsigned code on their consoles, enabling the playback of backup copies of games, including Small Arms. Small Arms is a physics-based platform brawler released
The terms you mentioned—JTAG and RGH—refer to specific hardware exploits for the Xbox 360: Small Arms -XBLA--Arcade--Jtag RGH-