pouët.net

WALL-RUN is for the ZX80/ZX81, (1k or 2k+), and is a simple open source machine code game.

The zip file has the source code, "zwall.asm" and 4 executables:
ZX81: zwall1k.p and zwall2k.p
ZX80: zwall1k.o and zwall2k.o

Use the keys "WADX" (W=up,X=down,A=Left,D=Right) to control your wall and trap the computer opponent. When you do, you progress to the next level. You have to trap the computer twice on level 2, 3 times on 3, etc.
Collect bonuses ($) for points, they score more on higher levels.
The level number (1-9) is shown on the top bar.

The 2k+ version has a bigger screen, score/high score and title screen.

Note that the souce code can conditionally compile the same code to ZX80 or ZX81, 1k or 2k+. This code demonstrates how you can write programs that work on both systems.

Is this the first pouet prod for the zx80?