The "Rev A" designation suggests this is a revised version of the original Japanese Doraemon NES release. This revision might include bug fixes, minor gameplay adjustments, or other refinements to improve the overall experience. These revisions are common in the video game industry to address issues discovered post-release.  Without further documentation on the specific changes, it remains largely similar to the initial Japanese version in gameplay and overall content. This version, nonetheless, demonstrates the dedication of developers to maintaining and improving their product.

Doraemon (Japan) (Rev A)

Doraemon (Ch)