Check Matt's awesome thread for the variants that are worth money to certain variant collectors. Two variants that are missing from his list are 5-screw Jaws and 3-screw Volleyball. Both are tough to find.
After looking through alot of these posts i found ive got a 3-screw arkanoid. and youre right it does have 3 screws i can take out with a flat head screw driver.
Im guessing by what you said the 3-screw arkanoid is somewhat rare.
NES Games = 720
NES Boxed Games = 187
ITS AN ADDICTION!! - Hey at least its not Crack! =]