In Area 2 of Stage 2, after you cross the floatingdocks you must fight two "Commanders". Shoot the boxlabeled "Danger" three times to score 5,000 bonus pointand to save some time.
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After the Tower (whether you blew it up or not), therewill be a normal shooting scene, then a scene where you can shootthe barrels. Shoot them until they explode (usually three) tocollect 5,000 bonus points and to speed up the game.
Turn the gun sideways and put your middle finger onthe trigger and your index finger on the slide of the gun.
In Stage 1, in the area where you get into the ship'sengine room with big fuel tanks, shoot through the first waveof enemies. Then, on the second wave straight ahead behind theenemies should be a fuel tank. Shoot it until it explodes. Thiswill save ammunition and time.
In the first level when you reach the part when yousee a tower, shoot at it with the grenade launcher. Wait for afew seconds and it should burst into flames.