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- Sound remix mode
Beat one of the indicated levels in the following games to unlock a "Sound Remix" selection on the options screen, which allows a remixed version of the background music to be played. Game -- Level
1942 -- 16
1943 -- 8
1943 Dash -- 5
- Special weapons (1943)
Hold the following buttons before the corresponding level begins to start with a special weapon.
1 Down
2 Weapon 1
3 Up/Right + Weapon 1 + Weapon 2
4 Down/Left + Weapon 2
5 Weapon 1
6 Left
7 Up/Left
8 Left + Weapon 1 + Weapon 2
9 Down/Right + Weapon 1 + Weapon 2
10 Up/RIght + Weapon 2
11 Up/Left
12 Right + Weapon 1+ Weapon 2
13 Up
14 Up/Left + Weapon 1 + Weapon 2
15 Down/Left + Weapon 1
16 Right + Weapon 1