To understand the distribution of Newer Super Mario Bros. Wii , one must understand the WBFS file format.
The 1.30 version distinguishes itself through several key technical achievements: newer super mario bros wii 1.30 wbfs
Version 1.30 is considered the "Final Major Stable Release." Earlier versions (1.0, 1.1, 1.2) had bugs, including occasional soft-locks, clipping issues in wall jumps, and versus mode desyncs. Version 1.30 addressed the following: To understand the distribution of Newer Super Mario Bros
Based on my research, here is a summary of the report: 1.2) had bugs