Mega Man 4 returned in 1999 as part of the Rockman Complete Works collection for the Sony PlayStation console, adding a save feature, a "navi mode" with tips to help guide players, and an arranged music score. Mega Man 4 Sound Collection includes both the NES soundtrack and PlayStation arrangements. The album can be purchased through Steam, with streaming on Spotify and Amazon Music Unlimited.
Mega Man 4 is included in the Mega Man Legacy Collection for Steam, Nintendo Switch, Xbox One and PlayStation 4.
From the product page:
A year after the destruction of Gamma, and Dr. Wily's defeat, the world is still at peace. One day a mysterious letter arrives for Dr. Light from an unknown scientist named Dr. Mikhail Cossack. Dr. Cossack plans to eliminate Mega Man and prove he is the greatest robot designer of all time.Steam - Mega Man 4 Sound Collection
It’s up to Mega Man to save the day once again. Mega Man 4 provides action based game play like the earlier games in the series. Rush, Mega Man's canine companion, is back to battle the baddies. Mega Man also has the ability to charge up energy inside his Arm Cannon, allowing him to fire larger and more damaging blasts.
Mega Man 4 commemorates 31st anniversary of launch today. Sound Collection composed by Minae Fujii available on Steam, now playing on #Spotify and Amazon Music Unlimited - https://t.co/doDrKufCYb pic.twitter.com/DdLSQkzgeI
— The Ongaku (@TheOngaku) December 6, 2022