Use the following trick to unlock all characters in under two hours. Enter VS. mode, and select Special Match mode. Set it to Stamina and Flower modes. At the character selection screen, give the CPU 1 health and your character anything over 1 health. Also, make sure that it is on 1 Life Stock mode. Set the stage to Shadow Moses Island, at least until Snake appears and you defeat him. Keep playing this way for approximately two hours and you have around 500 VS. mode games played. By then, you should have unlocked all characters. Note: Make sure you are using a character you are good with because after a certain number of rounds, you will unlock each character and have to face them in a fight. It is 1 vs. 1 -- so it is recommended that you use a character like Ike, who hits very hard. However, do not worry if you lose; after one more VS. mode round, you will get to try again. -From: Austin Graham

Setup a Special Brawl. Choose the options "Stamina" (matches are based off of HP) and "Flower" (characters will have a health-draining Flower on their heads at all times). Play against a single CPU character, and set their HP to 1, leaving your HP anything higher than 1. When a fight starts, your opponent will automatically die from the flower (this is a self-destruct) and the match will end. This method is very useful for unlocking anything that requires "Brawl on [stage name] a certain number of times" or "Brawl with [character name] a certain number of times", etc. It can also be used to easily increase the number of Brawls played to unlock characters and Assist trophies. The only thing it cannot unlock is anything requiring standard Brawl victories, as it is a Special Brawl and not standard.

To unlock the 75m stage, you must play as Donkey Kong twenty times. To easily unlock the stage, go to Special Brawl. Change the settings so that you have a flower on your head and stamina is at 1 HP. Then, choose DK and any stage. When the match begins, you will instantly fall down and the match will end. Do this twenty times to unlock the 75m stage. Note: You can do this to unlock other stages too as long as you meet the requirements.