Indicates this is the fourth installment, which historically contained more advanced features or expanded content compared to the original trilogy.

Rumors persist that the same SyQuest cartridge lot contained early design documents for Vol 5, including level maps and a complete storyboard. Archive_Cat has hinted at a potential "16L Updated" treatment for a fan-made reconstruction of Volume 5, using the original engine. Whether that will ever materialize remains to be seen—but the preservation community is watching closely.

To understand why this specific volume is so sought after, we have to break down the technical jargon:

"Vol 4" is common in manga or comic series, though no "Secret Junior Acrobat" is currently indexed in major databases.

" likely refers to a specific entry within a niche series of instructional or performance-based media. While the "Secret Junior Acrobat" title has appeared in various online archives and social media collections, it is often associated with specialized physical training or performance documentation from specific eras or regions.