Frogger (Genesis)

Frogger was the very last licensed game released in North America for the SNES and Genesis prior to both consoles leaving the North American market, and the last licensed Genesis title released on a physical cartridge until a promotional cart for the Sonic 3 film 26 years later.

Aside from that, it's really just a decent port of the arcade game with a clipart-quality title screen.

Level Select#

According to programmer Scott Marshall, he placed what he calls a "backdoor" in the final game; this backdoor is actually a level select code. His description of the code is incomplete; here is how to do the code:

1. On the Select Number of Players screen, hold C.
2. Press Right (×9).
3. With C still held, press A to add one and B to subtract one from a number that will only appear at the top left of the screen once you press A or B once. The range is from $01 to $0B. This number tells you which level you start at.

The function that handles this backdoor is at $15AA. At $1622 is a bit of code to set the internal counter to $0B, but this code does not appear to be used.

Revisional Differences#

Rev. A	Rev. B

A second revision of the game updated the title screen to include Konami as the trademark holder of Frogger.

Rev. A	Rev. B

This change also applied to the credits.

Rev. A	Rev. B

The second revision also removed the duplicate score display present on the first level.

Interestingly, soft resetting the second revision during gameplay causes a few quirks not present in the first. The first quirk is a buzzing sound that stops when on the player select screen. The second is getting an instant game over upon starting a game. Hard resetting the game will fix these issues.