could someone please tell me how many levels there are in Halo 3 single...

[NKlvr07]

...player campaign mode? how many levels are there?

 

[Byrd]

1. Arrival (Cutscene Only) (Non-playable) Tutorial (Only in easy and normal)
2. Sierra 117
3. Crow's Nest
4. Tsavo Highway
5. The Storm
6. Floodgate
7. The Ark
8. The Covenant
9. Cortana
10. Halo

 

[Alex L]

9

They are:

Sierra
Crow's Nest
Tsavo Highway
The Storm
The Floodgate
The Ark
The Covenant
Cortana
Halo