Basically the game is the same (if compared at space ace/ hard level)
What is introduced in the 91 version are the diagonal moves in some scenes instead of normal moves (up, down, right, left)
Mav
A variant version to have for space Ace fans
It can be played even if a DL II board but the roms set must be changed (or burned)
An OT question:
Which are the differences between Space Ace 1983 edition and the 1991 edition?
Some level added, or other things?
Unfortunatly I never seen and played
10X, Flip971.