How to get the tt amulet, in each world, there is one race course where a key to the locked door is hidden. Don't worry about what place you get, just find the key. The levels are ancient lake snowflake mountain (I think) crescent island and boulder canyon. Then win the race against tt and you will get a piece of the tt amulet.

Super boost, if you let go of the a button before boosting (boost pad or boost power from ballon) you will get a stronger and longer lasting boost then normal.

Characters: taj, beat adventure 1 drumstick in adventure 1 or two, throw a frog up to the top of the mountain with a green frog head silhouette, next to wizpigs head and another frog will jump down off the mountain. Squish it.
Wizpig, beat adventure2 T.T. He is the best character (I think) to unlock him beat every single time trial with except for the ones you have to buy.

Drumsick- Run over the Frog with a chickens head.

Taj- Complete Adventure Mode 1.

Wizpig- Complete Adventure Mode 2.

T.T- Beat all of the Time Trials with all modes of transportation. This does not include the 4 levels you need to buy in Adventure.