100% game easier
N.B.: This is a HINT not a cheat, this method still requires work!
To make 100%-ing the game easier, play through the entire game and get to know where everything is.
Then restart your game (you can keep your old save if you wish) then, before the first mission of each level complete a `lap` of the level.
(levels are in kind of a circuit) Make sure you go everywhere and do everything! OOnce you have completed the `lap` check your level progress.
If it isnt full marks (eg. 7/7) for everything apart from the story missions, try again.
I find this much easier than trying to remember where things are and search later in the game.
Hyrule...
We have more cheats and tips for this game here, The Simpsons: Hit & Run cheats
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