"Boss 1 - Vanja's Adventure" is a high quality rip of "Boss 1" from Vanja's Adventure.
Jokes[]
At 0:02, the rip becomes an arrangement of "Korobeiniki" (more commonly known as "Type A" from Tetris). The rip loops over at 1:18.
Instead of showing the image in the thumbnail, a logoswap of the thumbnail reading "Vanja's Tetris", with Vanja replaced with Tetris Ultimate's box art, is displayed instead.
The image used in the rip