Adventure Island - Stage 2 ~LoFi Remix~
Sounds like Mario's Underwater theme and Milon's Secret Castle Theme.
Sonic 1 LoFi Album: https://www.youtube.com/watch?v=OHZyOMXREMo&list=PLXRkwGvXTai6ZpQun1m47jgCIfSkfCjoQ&index=1
Sonic 2 LoFi Album: https://www.youtube.com/watch?v=fSOgJ0Vnn1Q&list=PLXRkwGvXTai4-TWd6zTFo-qZd6vppuLYx&index=1
Chill Music Collection: https://www.youtube.com/watch?v=w66enFEyK_Y&list=PLXRkwGvXTai5jJh36K6PZV3J1aknSrHsI&index=7
LoFi Music Collection: https://www.youtube.com/watch?v=RCXL8Ok0Oe4&list=PLXRkwGvXTai72zV36-omfERGPLTUE2OMf&index=1
More Remixes: https://www.youtube.com/watch?v=w66enFEyK_Y&list=PLXRkwGvXTai5jJh36K6PZV3J1aknSrHsI&index=7
Mashups: https://www.youtube.com/watch?v=_LlTLYhr85M&list=PLXRkwGvXTai4ZCKHKu_ovS8zNTEOz7IOh&index=5
Mega Man and Bass ~GeneSnes~: https://www.youtube.com/watch?v=S1Rme_TvAZ8&index=7&list=PLXRkwGvXTai4ybpQQg6xZgqC2I9J3Vbac
Want to Support me? - https://www.youtube.com/watch?v=HZB330co1TI&list=PLXRkwGvXTai5Fn4rfQrBal_pEN4C7SACv