Random Stage Exclusion
When you have unlocked ALL 40 of the stages in the game you will then get the option to exclude stages from the random stage selector that you don't want to play on.
Fight Crazy Hand in Classic Mode
When you have reached the Master Hand in under 9 minutes without using any continues on at least the 'Hard' difficulty setting Crazy Hand will then appear alongside Master Hand at the start of a match in Classic mode.
Unlock More Rules
This feature is found at the bottom of the 'Rules' screen and is unlocked by getting 200 KOs in Standard Brawl.
The following stickers cannot be collected randomly off the ground, to get them you have to complete a specific task. Below is a list of the stickers along with the game that the character originally appears in and the task which needs to be completed to unlock them.
Unlock Boo (Mario Tennis) - In the Home-Run Contest hit over 900 ft.
Unlock Ryuta Ippongi (Duendan 2) - In under 3 minutes, 30 seconds clear 100-Man Brawl.
Unlock Liquid Snake (Metal Gear Solid - The Twin Snakes).In Cruel Brawl defeat 10 Alloys.
Unlock Running Chibi-Robo (Chibi-Robo) - On the Easy difficulty setting using any character Clear Classic mode.
Unlock Phyllis (Animal Crossing - Wild World) - On the Normal difficulty setting using any character clear All-Star mode.
Unlock Hidden Assist Trophies
Collect the 6 hidden Assist trophies in the game by completing the indicated task for each one.
Unlock Gray Fox Assist Trophy - Unlock Snake.
Unlock Shadow the Hedgehog Assist Trophy - Unlock Sonic the Hedgehog.
Unlock Ray MK III Assist Trophy - Play 100 brawls.
Unlock Isaac Assist Trophy - Play 200 brawls.
Unlock Advance Wars Assist Trophy - Play 300 brawls.
Unlock Barbara Assist Trophy - Unlock at least 25 CDs.