Rockman 2 Dash is a Rockman 2 hack that attempts to reference to the first Mega Man game, by matching the stage design and music based on the shared attribute (such as Heatman with Fireman, Bubbleman with Iceman, Metalman with Cutman, etc). Weapons and bosses remained unchanged, though boss weaknesses have been altered.
longbao clears this rom hack in just a bit over 25 minutes.