Action 52: Billy Bob - NES - longplay
2There is a glitch when you pass level 2 and get enter level 3. It teleports you to level 4 of the game Cheetahmen which it refers to level 3 instead of level 4.
There are a whopping 11 unused levels for Billy Bob, all of them inaccessible by normal means because of a bankswitch bug (the bytes written to direct page 0xFE and 0xFF, which trigger the bankswitch, are switched by accident, meaning the bank switch fails). Even if you beat all of the levels, the game will crash because of another bankswitch gone wrong. This game is the first one in the ROM, even if it isn't the first one numbered on the list. However, there are only four that can be accessed with the hex editor and it can't be done in the same fashion as the unused levels in Ooze and Rocket Jockey. Also, expect this process to take a few tries, and have a save state of the game selection screen ready if you make a mistake.
Due to the way the cart handles bankswitching, a few games had to be split up into two or more parts. Each of these parts is essentially a standalone game (hence why you can't exit Billy Bob from Level 3 onwards) and is based on the same code template as every other game on the cart. As a result, a few ROM banks contain a default menu template.
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