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Version Differences

Weapon Get Cut Scenes

The most obvious difference between the US and Japanese release of the game are the cutscenes after clearing one of the 8 robot stages. On the US cart, you only ever see Dr. Light talk to Mega Man. On the J cart, you can see any of Dr. Light, Roll, or Auto.

Dr. Light is always the fastest conversation. Auto is usually the longest. The notable exception is "Burst Roll".

Timing Differences

Data courtesy PJ. Better Formatting in progress 

Bass dialogue

Segment NA (time) JP (diff) JP (Light) JP (Auto) JP (Roll) JP (Average) JP (Best) JP (Worst)
Intro 123.278 -6.922       -6.922 -6.922 -6.922
Bass Dialogue 12.995 -0.216       -0.216 -0.216 -0.216
Cloud proto 14.459 -0.765       -0.765 -0.765 -0.765
Cloud weapon get 27.521   -3.611 0.799 0.666 -0.715 -3.611 0.799
Junk end load 2.446 -0.017       -0.017 -0.017 -0.017
Junk weapon get 28.686   -3.943 1.032 -0.566 -1.159 -3.943 1.032
Freeze weapon get 26.306   -1.048 5.075 3.278 2.435 -1.048 5.075
Burst weapon get 27.754   -4.210 2.363 6.872 1.675 -4.210 6.872
Pre-museum lab 49.900 -11.913       -11.913 -11.913 -11.913
Post-museum lab scene 7.338 -0.383       -0.383 -0.383 -0.383
Turbo proto 14.093 -0.599       -0.599 -0.599 -0.599
Turbo weapon get 25.973   -1.414 2.047 3.311 1.314 -1.414 3.311
Shade load 19.651 -0.050       -0.050 -0.050 -0.050
Shade proto 1 18.486 -3.611       -3.611 -3.611 -3.611
Shade proto 2 36.106 -2.313       -2.313 -2.313 -2.313
Shade weapon get 28.486   0.150 5.724 2.529 2.801 0.150 5.724
Slash weapon get 23.910   0.083 4.509 6.123 3.572 0.083 6.123
Spring weapon get 27.920   -3.877 1.464 -0.266 -0.893 -3.877 1.464
Lab cutscene 76.456 -6.805       -6.805 -6.805 -6.805
Bass 1 intro 10.532 1.980       1.980 1.980 1.980
Bass 1 end 7.754 -1.864       -1.864 -1.864 -1.864
Bass 2 intro 18.885 1.697       1.697 1.697 1.697
Bass 2 end 8.719 2.629       2.629 2.629 2.629