NEW SOLUTION: you can download levels that are no longer available in-game by going to the following website: https://infinity.disney.com/toybox/hub
(thanks to b0seiju for this info!) you will then find them available under Disney's Toy Boxes.
you can either have items or characters with the needed abilities unlocked on the 360 version (or bought on the win8 game), or you can use items found in the downloaded community levels by going to Toy Box Share, and Disney's Toy Boxes in the menu.
Invisible: download - GRAVITY FALLS- not sure which one, i will update if someone lets me know. (https://infinity.disney.com/toybox/search?utf8=%E2%9C%93&...
) near the middle, back behind the mountain in the middle.
download - SUPER FUN TRACK (https://infinity.disney.com/toybox/9c3e9e7a7dda4feb88276af75...
) located on the ground directly behind you.
download - OFF THE WALL-E (https://infinity.disney.com/toybox/ee1d7f16524646ad9596449dc...
) underneath a stone arch straight ahead from the starting point.
360 - have Violet or the Invisinator unlocked and become invisible in the win8 game
purchase - you can pay to unlock Violet for $2 USD or enter the code found on the card that comes with the figure.
Goo'd Big & Small: download - WRESTLING ARENA (https://infinity.disney.com/toybox/30683758e8964d0d9a0088c19...
) run straight into the arena and you will find the green big goo pad ahead of you, go around the side of the ring to find the purple small goo pad.
360 - have the goo pads unlocked and use them in the win8 game.
Tripwire: download - WOODY'S ROUNDUP (https://infinity.disney.com/toybox/ae59411bd0a74a2599dcd06c8...
) go through the stone archway behind you past the general store, run between the stable buildings through the wooden door, you will pass a wagon and the tripwire is to the right.
360 - have tripwires unlocked and use them in the win8 game.
how to unlock items in the 360 game: step on the yellow vault icon on the disney infinity base and shuffle the items until you see what you need as one of the 16 items. to guarantee getting the items you want you can save 16 spins to use at once. also you can try to get more than one desired item showing at a time to maximize your spins.