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What triggers the secret debug menu in The Adventures of Willy Beamish?

An addendum to the YouTube video where I figure out how to trigger the secret debug menu in The Adventures of Willy Beamish.

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The marching little byte in Eggerland Mystery

A weird section of memory caught my eye while reverse engineering Eggerland Mystery, a set of data in which a single byte seemingly marched on. So, I try to figure out what exactly this area of memory represents.

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How are levels stored in Eggerland Mystery?

Let's take a look at how level data is stored within the Eggerland Mystery ROM. There are two algorithms used for level storage, and we discover some remnants of some hard choices they had to make in 1985.

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