You have to beat the whole game of srb2 without an cheats
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No you can't unlock Jet.
You Can't He Is Only A Referee
They call it Super Mario Bros Wii for a reason
Battle Mario and Sonic in SUPERSMASHBROS in unlock Bowser
To unlock events you have to place in the circuits (1st,2nd,3rd) and you will unlock the next circuit and an event.