Several years ago, when I first got into Halo, I bought all the games and played them in order. The only copy of Halo 2 I could find at the time was used. The disc was dirty, but nothing a little cleaning couldn't fix. At various parts throughout the campaign, strange shapes would appear and block out parts of the HUD. Most of the shapes were tan rectangles. My friend suggested that it was because some older Xbox titles don't run well on the 360, but I've never heard of this problem before. I went to replay the game today and it still has the same problem. Would anyone happen to have an idea of what is going on? The game is still playable, but it's quite irking.