Talk:Akashi's Improvement Arsenal/@comment-36.80.96.150-20151230184253/@comment-26874818-20151230193924

upgrading Type 3 to Type 4 Sonar is a waste of screws. don't do it. even Mutsuki class can clear world 1-5 with Type 3 Sonar and depth charge.

kept your screws. wait until you have a lot of them. the first equips you craft should be the 10cm High angle + Fire director. it grant you Anti aircraft cut in ability.

other choice has already said by Shadow27x.