My 7 year old son completed ALL of Portal 1 last night (from beginning to end) COMPLETELY by himself. I did not help him or give him hints in any way! This is a proud day for me lol! (I know tons of adults that couldn't do this). I've got him going through the advanced chambers now... Then either a few of the challenges, or may let him start on Portal 2
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I started as 14 and its been a year where i've learned a lot!