Halo CE because me and my dad sunk hundreds of hours into this game on Legendary as a child and i still play it even to this day. You can never really beat the classics because of those memories.
I got an Xbox with no games for my 6th birthday and I didn't know what this box was or what it even did. A few days later my brother told my mom "Get him the game Halo as soon as you possibly can." My mom later bought it and I now had a copy of Halo CE. After figuring the console out for 20 minutes I put the disc in the tray and it loaded up. Then waking up at 6:00 in the morning to play this gift from god everyday had started. I have been playing Halo and had an xbox ever since. I <3 Bungie