Grid Run 64

Guide your ship along the grid and collect every diamond. Four guards patrol the edges of the grid and fire energy bolts along the grid lines. A hit costs a ship and fills the board with more diamonds. Clearing the board takes you to a faster level. Diamonds score 10 times the current level, and another ship is awarded every 5,000 points. You start with three ships, and the session high score is kept, as in the original.

The original is one BASIC SYS line followed by about 2 KB of 6502 machine code; its rules and timing were reconstructed from that program, the magazine article and play in a Commodore 64 emulator. Movement stays continuous, with direction changes at intersections, and new tile and sprite art fits the ColecoVision screen.

Controls: either joystick. The stick steers the ship at each intersection; a button starts the game and replays it after game over.

ColecoVision version by Amy Studio, written in Amy, the language by Amy Bienvenu. From RUN magazine, December 1990, and its ReRUN disk: original Commodore 64 machine-language program by Tony Brantner. This is a modern homebrew adaptation, not a commercial Coleco release.