maybe he played them all but he didn't beat them all
remember reading an interview with someone who was on a quest to beat every nes game ever released, think he was stuck on some obscure japanese games such as a piano simulator (which would require him learning to play or something)
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Its only taken me about 10 years to understand the water jug riddle in Die hard with a Vengeance. My brain takes a while, but it gets there in the end