Is the orange box three separate disc

No, it's 5 separate games on 1 disk. 1) Half Life 2; 2) Half Life 2: episode 1; 3) Half Life 2; episode 2; 4) Portal; 5) Team Fortress 2. Team Fortress 2 is the best online game you'll ever play. I got the orange box for $18.00 at Game Stop. It's worth it...trust me. It's also good if you're an achievement hunter. It has 99 achievements. like 70 of them are some of the easiest ones to get.