I was extremely good at a competitive puzzler about 15 years ago (basically a competitive form of Puzzle Bobble), winning several events with in game prizes that I sold for chunks of cash. I also got to high diamond in League of Legends in 2014, and I reckon I was the best player in Europe on my not very popular main champion (I was certainly in the top 10).
In terms of single player games, probably getting the platinum for Crash 4. Very long with a lot of tough time trials and all boxes/no death gems.
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