When you complete the following tasks in any difficulty setting the corresponding stage will become available.
Unlock Enemy Base Stage:
Complete 25 Vs mode matches or beat 10 mission in Mission mode.
Unlock Western Town Stage:
Complete 45 Vs mode matches or beat 30 missions in Mission mode.
Unlock Space Lab Stage:
Clear ALL 51 Mission mode missions.
Unlock Warehouse Stage:
Complete 95 Vs mode matches.
Unlock Garbage Dump Stage:
Complete 125 Vs mode matches.
Added by: Sanzano Sep 25th 2009, ID#3159