Leap Frog

Ribbit the frog sits on a log. Dragonflies come down from the sky and flutter about, and the button shoots his tongue straight up to swat one, for 10 points times the level. A swatted fly jumps and drops, so dodge it. A snake wanders the log with its head bobbing: hop over it. Touch the snake or a fly and Ribbit hops away, and that frog is lost. You have three frogs, with one more every 2,000 points. Catch all the flies of a level, 13 to 20 of them, to go on to the next, faster level; there are 15.

The rules are the original machine code's own, kept in its units: the Commodore 64 screen positions, the main loop's timing and random choices, and its pixel-exact collisions, with the original sprite shapes kept as masks. The port runs the same number of game-loop passes per frame as a real NTSC Commodore 64. New pictures of the sky, log and reeds, a title picture, a title menu with HOW TO PLAY and CREDITS, and an original title tune are added; the original's pause and RUN/STOP keys are left out.

Controls: either controller. The joystick walks left and right; up hops in place, and up-left or up-right hops over the snake. Either button shoots the tongue.

ColecoVision version credited in the source to Claude (an AI made by Anthropic) for Amy Studio, in Amy, the language by Amy Bienvenu, 2026: a faithful adaptation of the original program. From RUN magazine's July/August 1992 ReRUN disk: original Commodore 64 machine-language program by Tony Brantner. This is a modern homebrew adaptation, not a commercial Coleco release.