It's backwards compatible. You can either upgrade your 360 thru live or by burning a cd.
http://www.xbox.com/en-US/games/backwardscompatibility.htm
Original Xbox Games Playable on Xbox 360
List updated December 2006.
# 4x4 EVO 2
# AirForce Delta Storm
# Aggressive Inline™
# Alias™
# Aliens versus Predator™ Extinction
# All-Star Baseball™ 2003
# All-Star Baseball™ 2005
# Amped®: Freestyle Snowboarding
# Amped® 2
# Aquaman: Battle of Atlantis
# Army Men®: Sarge's War™
# Atari® Anthology™
# ATV: Quad Power Racing 2™
# Bad Boys 2
# Big Mutha Truckers
# Baldur's Gate™: Dark Alliance™ II
# Barbarian
# Barbie™ Horse Adventures™ Wild Horse Rescue™
# Batman Begins™
# Battle Engine Aquila
# Battlestar Galactica™
# BLACK™
# BMX XXX™
# Brute Force™
# Buffy the Vampire Slayer New
# Buffy the Vampire Slayer™: Chaos Bleeds
# Burnout® 3: Takedown™ Updated
# Cabela's® Big Game Hunter™ 2005 Adventures
# Cabela’s® Dangerous Hunts™
# Cabela’s® Outdoor Adventures™ 06
# Cabela's® Deer Hunt™ 2005 Season
# Cabela's® Deer Hunt™ 2004 Season
# Call of Cthulhu®: Dark Corners of the Earth™
# Call of Duty™: Finest Hour™
# Casino
# Catwoman™
# Chicago Enforcer
# Circus Maximus
# Close Combat: First to Fight
# Colin McRae Rally 4
# Combat Elite: WWII Paratroopers™
# Commandos 2: Men of Courage™
# Conflict: Desert Storm
# Conker: Live and Reloaded New
# Constantine™
# Counter-Strike™
# Crash Twinsanity™
# Crash Nitro Kart™ 2
# Crimson Skies®: High Road to Revenge™
# Crouching Tiger, Hidden Dragon™
# Dark Angel
# Darkwatch™
# Dead or Alive® 3
# Dead Or Alive Ultimate New
# Dead to Rights®
# Deathrow
# Destroy All Humans! New
# Digimon® Rumble Arena® 2
# Dinotopia2
# DOOM 3®
# Drake™
# Dreamfall: The Longest Journey
# Dynasty Warriors 4 New
# Egg Mania™: Eggstreme Madness
# ESPN Major League Baseball
# ESPN MLS ExtraTime 2002
# Euro 2004
# Evil Dead: A Fistful of Boomstick New
# F1 2001
# Family Guy New
# Fable®
# Fable®: The Lost Chapters™
# Fairly Odd Parents: Breakin' da Rules
# Far Cry: Instincts New
# Fatal Frame™
# Fatal Frame™ II: Crimson Butterfly DIRECTOR'S CUT
# FIFA Soccer 2003
# FIFA Soccer 2004
# FIFA STREET
# Fight Night 2004
# FlatOut™
# Ford Mustang
# Ford vs. Chevy
# Forza Motorsport™
# Freaky Flyers
# Frogger Beyond™
# Futurama™
# Fuzion Frenzy®
# Gauntlet®: Seven Sorrows™
# Genma Onimusha
# Goblin Commander™: Unleash the Horde
# Grabbed by the Ghoulies™
# Grand Theft Auto: The Trilogy
# Grand Theft Auto: Vice City
# Grand Theft Auto: San Andreas™
# Gravity Games Bike: Street. Vert. Dirt.
# Grooverider: Slot Car Thunder
# Half-Life® 2
# Halo®
# Halo® 2
# Halo® 2 Multiplayer Map Pack
# Harry Potter and the Goblet of Fire™
# Harry Potter and the Sorcerer's Stone™
# He-Man: Defender of Grayskull
# Hitman: Contracts™
# House of the Dead 3
# I-Ninja New
# IHRA Drag Racing Sportsman Edition
# IHRA Professional Drag Racing 2005™
# Indigo Prophecy New
# Incredibles New
# IndyCar® Series 2005
# Intellivision Lives
# Jade Empire™3
# James Bond 007™: NightFire™
# Judge Dredd®: Dredd vs. Death™
# Jurassic Park: Operation Genesis
# Kabuki™ Warriors
# Kelly Slater's Pro Surfer
# kill.switch
# Leisure Suit Larry: Magna Cum Laude New
# LEGO® Star Wars®
# LEGO® Star Wars™ II: The Original Trilogy
# Lemony Snicket's A Series of Unfortunate Events™
# Links® 2004
# LOONS—The Fight for Fame
# Magatama
# Manhunt
# Mat Hoffman's Pro BMX™ 2
# Max Payne
# Max Payne® 2
# Maximum Chase
# Medal of Honor European Assault™
# Medal of Honor™ Frontline
# Medal of Honor™ Rising Sun
# Mega Man® Anniversary Collection
# Metal Arms™: Glitch in the System
# MicroMachines
# Mike Tyson Heavyweight Boxing
# Minority Report
# MLB SlugFest 20-04
# Monster Garage™
# Mortal Kombat: Armageddon New
# Mortal Kombat® Deception™
# MotoGP New
# MTV Music Generator™ 3
# MTX: Mototrax™
# Murakumo: Renegade Mech Pursuit
# MX Unleashed New
# MX vs. ATV Unleashed
# MX World Tour™: Featuring Jamie Little
# Namco Museum™
# Namco Museum 50th Anniversary Arcade Collection
# NBA LIVE 2004
# Need For Speed™ Underground 2
# NFL Blitz 2002
# NFL Blitz 2003
# NFL Blitz 2004
# NHL® 2004
# NHL Hitz™ 2003
# Ninja Gaiden®
# Ninja Gaiden® Black
# Open Season New
# Outlaw Golf 2
# Outlaw Tennis
# Outlaw Volleyball
# Over the Hedge™
# Pariah New
# Phantom Crash™
# Pinball Hall of Fame™
# Pitfall®: The Lost Expedition™
# Predator Concrete Jungle™
# Prince of Persia: The Sands of Time™
# Pro Evolution Soccer 5
# Pro Race Driver™
# Psychonauts New
# Pump It Up™: Exceed
# Pure Pinball
# Puyo Pop Fever2
# Quantum Redshift®
# RalliSport Challenge
# Rainbow Six Lockdown New
# Rapala Pro Fishing New
# Rayman Arena
# Raze's Hell™
# Red Dead Revolver
# Red Faction® II
# RedCard™ 2003
# Richard Burns Rally
# Robotech: Battlecry
# Rocky™ Legends
# Rogue Ops
# Rogue Trooper™
# Samurai Jack
# Samurai Warriors™
# Scarface New
# Scooby Doo!™ Night of 100 Frights
# Scrapland
# SEGA GT™ 2002
# Serious Sam
# Shadow The Hedgehog™
# Shamu's Deep Sea Adventures
# Shark Tale New
# ShellShock: Nam '67™
# Shenmue II New
# Shincho Mahjong
# Sid Meier's Pirates!®
# Silent Hill® 4: The Room
# Smashing Drive
# Sneakers™ 5
# Sniper Elite
# Soccer Slam
# Sonic Heroes™
# Sonic Mega Collection™ Plus
# Soul Calibur 2 New
# Spawn® Armageddon
# Speed Kings™
# Sphinx and the Cursed Mummy™
# Spider-Man™
# Splat Magazine Renegade Paintball
# Splinter Cell: Double Agent New
# SpongeBob SquarePants™: Battle for Bikini Bottom
# The SpongeBob Square Pants Movie New
# SpyHunter® 2
# SpyHunter:® Nowhere to Run™
# Spyro™ A Hero's Tail
# SSX 3
# Stake™
# Star Wars Battlefront™
# Star Wars Battlefront™ II
# Star Wars®: Episode III Revenge of the Sith™
# Star Wars® Jedi Knight®: Jedi Academy™
# Star Wars®: Knights of the Old Republic™
# Star Wars® Knights of the Old Republic® II: The Sith Lords™
# State of Emergency
# Street Racing Syndicate™
# Stubbs the Zombie™ in Rebel without a Pulse™
# Super Bubble Pop
# Super Monkey Ball™ Deluxe
# SX Superstar™
# Taz Wanted
# Tecmo Classic Arcade
# Teenage Mutant Ninja Turtles™
# Test Drive®: Eve of Destruction
# Tetris Worlds™4
# The Great Escape
# The Hulk™
# The Incredible Hulk™: Ultimate Destruction
# The Incredibles: Rise of the Underminer
# The Legend of Spyro™: A New Beginning
# The Lord of the Rings™: The Return of the King™
# The Punisher™
# The Simpsons™ Hit and Run™
# The Simpsons™ Road Rage
# The Suffering
# The Terminator™ Dawn of Fate
# The Thing™
# Thief: Deadly Shadows™
# Tom Clancy's Ghost Recon
# Tom Clancy's Ghost Recon™ 2
# Tom Clancy’s Ghost Recon™: Island Thunder™
# Tom Clancy's Ghost Recon® 2 Summit Strike
# Tom Clancy's Rainbow Six® 3
# Tom Clancy's Rainbow Six® 3 Black Arrow™
# Tom Clancy's Splinter Cell®
# Tom Clancy's Splinter Cell® Chaos Theory™
# Tom Clancy's Splinter Cell® Pandora Tomorrow™
# Tony Hawk's American Wasteland
# Tony Hawk's Pro Skater™ 4
# Tony Hawk's Underground 2
# Torino 2006™ Winter Olympics
# Tork™: Prehistoric Punk™
# Toxic Grind
# Trigger Man™
# True Crime: Streets of LA
# Ty The Tasmanian Tiger™
# Ty the Tasmanian Tiger™ 2: Bush Rescue™
# Ty the Tasmanian Tiger™ 3: Night of the Quinkan
# Ultimate Spider-Man New
# Urban Freestyle Soccer
# Vexx™
# Vietcong™: Purple Haze
# Volvo: Drive for Life
# Wakeboarding Unleashed: Featuring Sean Murray New
# Whacked! New
# Winback 2: Project Poseidon New
# World Soccer Winning Eleven 9
# World Series® Baseball 2K3
# Worms 4 Mayhem
# Worms™ Forts: Under Siege
# Wrath Unleashed™
# WWE™ Raw™ 2
# X2 Wolverine's Revenge
# Xiaolin Showdown New
# XIII
# Yourself!Fitness™
# Zapper™
