The international version of this game is more difficult than the original Japanese version. Some of the changes include having the auto-aiming function disabled and reducing the number of saves per ink ribbon from 6 to 3.

The change in difficulty was apparently done to give players less of a chance at beating the game on rental, so they'd have to buy it for themselves instead. Since renting video games in Japan is illegal, there was no need for the developers to increase the difficulty in the original Japanese version.