The Game Boy color was an unnecessary system in many ways. It was released in 1998 when Nintendo had long vanquished their competitors in the portable market. The Game Boy Advance was presumably in development at the time. For all intents and purposes the Game Boy Advance is a held held Super Nintendo while the Game Boy Color is only a souped-up NES. Certainly Nintendo could have slid by with the black & white Game Boy for a couple more years.
Harry Potter and the Chamber of Secrets is one of those variety games where you do something different in each level. There's a flying stage, wand shooting stage, exploring stage and so on. Most games of this type can be labeled "jack of all trades, master of none", Harry Potter and the Chamber of Secrets is no exception. That's not a knock on the game, it's meant for kids and serves its purpose.
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