The fact that it's a custom chip likely means nobody will have one, other than you might luck out and find a cosmetically damaged game you can salvage one from. It's probably a custom programmed microcontroller, if you know someone who's into electronics it's probably possible to program a modern chip to emulate the one in the game but it would depend on knowing exactly what the original is supposed to do.
I am aware the chances of finding such a custom microcontroller chip are remote. However, posting here, we never know.
How do I know this chip is bad ? Very simple: proper troubleshooting on my bench proved that other discrete components around the chip (+5V regulator, caps, resistors, diodes and transistors) are all good. Xtal/Clock runs properly on the chip (checked on scope). Supply is fine. I also checked that there is no AC ripple on the +5V. There are no cold solder joints nor broken traces. The only thing left really is this chip. Before anyone asks, I do have proper instruments (DVM, ESR & cap testers, scope, etc.).
Now, while it would be possible to reverse engineer that thing and build something to replace it using a microcontroller or processor/EPROM, it is definitely not worth my time nor money to do this. It would be easier to build something from scratch, using the same rules as the current game. However, not worth my time since it is only for a cheap toy I am trying to revive for a neighbor, and I have many other projects and limited time...
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