Berlin Wall

Welcome to the Berlin Wall. Your task is to create a wall. Each time you create a wall down the center of the screen, it will be removed and you will earn points. The number of points is determined by the speed of the game.
Your game pieces are controlled by the keys on your keyboard.
Here is a summary of commands.
r rotates the red piece
t moves the red piece upward
d or f walk the red piece to the right
c slides the red piece
v moves the red piece downward
b boss key
u rotates the purple piece
i moves the purple piece upward
k or j walk the purple piece to the left
n slides the purple piece
m moves the purple piece downward
q quits the game
Press a number key to adjust game speed: 9=slowest, 1= fastest
Your keyboard makes two independent keypads.
The left keypad is for red and the right keypad is for purple:
red purple
rt ui
df jk
cv nm

What is abandonware ?