I really enjoyed this movie. Nothing too complicated. Just fun and simple. Not to mention the 2 main twin girls are cute and adorable.
Are there any more movies that area similar to this one or any other movies with the 2 main girls in it together besides The Twins Effect?
I didn't like it, but if you liked it you can try Wushu, Fatal Contact and other HK action films which is similar.
For 2 main girls in a film, you can try Police Assassins(Yes Madam), it's 20 years old, but much more great than the ones i've mentioned.
For 3 main girls in a film, go for Heroic Trio.
For 4 main girls in a film, watch A.F.R.I.K.A.
For 5 main... I don't know.:)