Rockman 2: Basic Master is a complete level hack of Rockman 2 for the NES. New music, new (and old) enemies, different boss behaviors, and more.

[Specification changes, etc.]
-If you press Select + Start with “EXIT” selected on the weapon selection screen, you can escape from the current stage and view your current password.
-The energy balancer is the initial equipment. If the currently equipped weapon recovery has the highest priority and there is a recovery surplus, it is assigned to other weapon recovery in ascending order of energy.