The level order in the Japanese version is a set of levels arranged in a quadrilateral form, with an interconnection between different stages. Some stages have alternate exits, similar to Super Mario World.
The Japanese version uses primarily a battery back-up, but the passwords are also an option.
The Japanese version has multiple endings depending on the player's performance.
Source: Wikipedia, "TwinBee: Rainbow Bell Adventure", available under the CC-BY-SA License.