"Fortress - Metal Gear Solid: Portable Ops" is a high quality rip of "Fortress" from Metal Gear Solid: Portable Ops.
Jokes[]
At the start, elements of "Raft Ride" are arranged to the advertised track. At 0:22, it switches to "Fairy Tale Path" from Yume 2kki. At 0:32, it switches again to "100 Sunny".
The combination of these three songs references them having similar channel events, with Raft Ride Day on SiIvaGunner, The Fairy Tale Path-over on VvvvvaVvvvvvr, and Gadget Week 4 & Sunny on TimmyTurnersGrandDad.