- cancel marker and boss hp and in stage 4 armored vehicles hp will increased nearly half.
- both player will get item (include life) if shoot the item box.
- in stage result both player can get life or score bonus depend on accomplishment.
ex: if one player succeed in no continue or no damage or bullet ridden that accomplishment will counted as success. (don't have to be accomplished by both.)
however can't get medal more than bronze medal
there is rule which player must follow to get more great medal
1. do not set difficulty lower than easy.
2. do not set life more than 5.
3. do not accept second player.
- rank will increased faster.
- stage 2 boss throw more grenade.
- one player will survive when both player life become 0
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