Blocks from Hell

Blocks from Hell (released initially in late 1992 and widely distributed in 1993) is a deeply obscure freeware puzzle title from the golden age of DOS shareware and BBS (Bulletin Board Systems) culture.
It was programmed and independently released by Toren K. Smith. In a neat bit of trivia, while this developer shares a name with the late, famous Canadian manga translator and Studio Proteus founder Toren Smith, this game was actually the work of a hobbyist garage programmer. Rather than attempting to reinvent the wheel, the game was built to be a hyper-optimized, lightweight iteration of a timeless concept.
Blocks from Hell is a traditional, unpretentious clone of Alexey Pajitnov’s legendary Tetris. Randomly selected geometric sets of blocks (tetrominoes) steadily fall from the top of a narrow, vertical grid shaft. The player uses direct keyboard controls to rotate and slide the shapes into place before they hit bottom. Your objective is to line up the shapes to create solid horizontal rows across the screen.
Completing a full row causes it to immediately flash and disappear, shifting all blocks above it down and awarding score points.
If you mismanage your blocks and leave too many empty gaps, the column will stack all the way up to the ceiling of the play area, resulting in a sudden "Game Over."
The scoring is pretty easy - you get 6 points for each piece you play, plus a bonus for the level number you're on, plus a bonus for each line that it fell while being dropped with the space bar, plus a bonus if you don't use the "Next Piece" option. When you clear lines, the scoring is as follows:
1 line : 100 points
2 lines : 200 points
3 lines : 400 points
4 lines : 800 points

What is abandonware ?