i don't know what the password is but i played this through the other day. it's rather mediocre after all. levels repeat quickly ( and i really mean repeat in the sense of reusing them ). controls are ok but balancing is rather poor in general. nothing for you unless you are a die heart fan.
for those unable to read simply do the following:
on startup screen press 'START'. select first option lauinches a new game, second one loads the last one. on the main screen then select the first one and then again the first one for obtaining missions ( press A until all obtained ). go back to main menu and select the third option. pick a level with 'NEW' and get going. option two on the main menu allows you to fiddle with your zoids equipment. the rest should be easy to pick up.