How many of you like to hack your game saved data and how good are you?

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I like to hack my saved data for my computer games. It makes the gameplay exciting and fun. Unfortunately I can't hack all my saved games because the criteria for me to do so is that every saved game data must be the same size. Saved game data that I managed to hack would mostly be those emulated games. I also manage to hack Dynasty Warriors Hyper 4 saved data. What about you?