This is to deter hackers that use unlicensed cheat code engines (such as Action Replay and Ocarina) to gain unlimited lives from cheating. It is also a cool Easter Egg if you do manage to gain 99 lives legally.
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in my guide it said if you get 99 lives, Mario takes his hat off. lose your 99 lives and he puts it back on.
You have to get 99 lives
This is what is sometimes called an 'easter egg' which does not affect the game in any way but it's just interesting. Mario does away with his cap (not the propeller cap; he needs that!) when he gets 99 lives in New Super Mario Bros. Wii. 99 is the maximum number of lives you can get.
On level 1-1, when you see the big mushroom, let it go left until it is just about to go off the cliff. then grab it and go all the way to the end of the level. if you do it right, you will get 5 lives. do that repeditly and eventually you will reach 99 lives. P.S mario's hat will be gone whenever you still have 99 lives.
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