The Grinch

Spin 'n' Win mini-game:
Destroy 750 gifts, then go to the upper level of Mount Crumpit to access the Spin 'n' Win mini-game.

Pankamania mini-game:
Destroy 1,500 gifts, then go to the upper level of Mount Crumpit to access the Pankamania mini-game.

Copter Race Contest mini-game:
Destroy 2,500 gifts, then go to the upper level of Mount Crumpit to access the Copter Race Contest mini-game.

Bike Race mini-game:
Destroy 3,000 gifts and complete 100% of the game. Look behind the bookcase in the workshop with the sleigh to access the Bike Race mini-game.

Hint: Reaching high places:
If you are having trouble getting to high places, look for a bar and press A. When you are swinging with Y, press A button to make The Grinch jump off the bar.
Information in this section was contributed by sc.wilson.

Hint: Extra presents:
Use the egg launcher to shoot the kids to make them drop their presents.

Slime the security guards to get a present.
Information in this section was contributed by Marshmellowmom.

Hint: Hidden presents:
Look on top of the town's Christmas tree to find a hidden present.

Look for walls of ice in downtown Whoville. Shoot them with the rotten egg launcher. There are secret presents behind them.

Hint: Getting the presents the kids are guarding:
In Whoville, there are little kids who are guarding presents that give you 10 points. They are dancing to the music that the little horn thing beside them is making. If you shoot the kid with the Rotten Egg Launcher, the kid will go away. You cannot get the present while the music is playing. Slime the horn with the Slime Gun, then you will be able to get the present.
Information in this section was contributed by hssnoopy.

Hint: Getting the sleigh part in Downtown Whoville:
This is the most difficult sleigh part to collect. Throughout Downtown Whoville, there are some sort of snowplows driving over the snow. Get behind one of them, then wait for the door at the back to open and shoot it with your Rotten Egg Launcher. This will make it explode, revealing the part.
Information in this section was contributed by Matthew020192.

Hint: Entering Town Hall:
Use the egg launcher to shoot the clock to get inside Town Hall.

Hint: Entering the Clock Tower:
To enter the Clock Tower, get all the blueprints for the Jet Spring. Then, equip it, stand on the "lift", and shoot upwards towards the closed hatch. The Grinch will automatically grab the hatch's lever and open it.
Information in this section was contributed by Matthew020192.

Hint: Finding the blueprints:
Go to the bottom level of Town Hall and find the three rugs on the wall that appear differently than the others. Pull out the rugs to find the blueprints.

Hint: Sculpting Tools:
To get the Sculpting Tools in Whoville, enter the Town Hall. Then, go to the room across where the statue is located to find see a rug or cabinet type thing on the wall in the back of the room. Approach it and press Action. It will hold on to the cabinet. Move it to the side. Press Action to pull out the safety. Jump, do a pancake on it, and the tools will pop out.