ROBBERY (1K ZX81)
by David Webber
from ZX Computing (June/July 1984), page 39

The jewel phantom strikes again! Here's the plan: sneak past the guard and half inch the jewels. Just to check that you've got what it takes, try this simulation first. You are the thief (inverse<) and the guard (inverse 0) tries to catch you by patrolling the top and left of the vault (pound sign).

To move, use the cursor keys 5,6,7 and 8 but be warned; if you are caught or stray from the playing area then you will be put back to the beginning and your aim is to get the jewels in the quickest time. David's best is a pretty fast 5; mine is a dismal 9. This is one game where flashing characters are used deliberately to increase the difficulty level!