part 1:if u want to unlock baloon fighter it will be easy play a match at icicle mountin with the music track balloon fight (see below)for 10 minutes,hold L&R at same time well stage is loading to change music track,play as the ice climbers agianst ice climbers with item drop hi using only freezies after the match baloon fighter will chalenge you

Part 2: to unlock the stage luigie's mansion simply get 10 vacuem luigi trophies then do luigi vs. mario and u will hav it

part 3: to unlock the item nuclear rain showere from tanks just play a match with samus and link with high item drop rate with bob-ombs and motien senser bombs using only ther
b-down moves then you will unlock it it is a little comuter animated tank that u throw in the air and it points up fires somthing and vanishes at the last 20 seconds of the matck
it rains little silver things that hit the ground an blow any enemy up in the air with the range of one of thosre explosiv things at peaches castle