I believe it can. We got the Wii starter pack, but when we went to the website to enter the codes for the figures there we were prompted to connect the portal direct to the computer. I assume that would be done by using the usb receiver thing we put into the back of the wii. I didn't try it yet, but that is my understanding.
I also believe the figures can travel between systems (ie a hero leveled on wii can be taken to a friends house with playstation and played right into their system with same level and hat etc...) so the portals themselves are probably universal.
Sorry, disregard above, just read this in a different thread on 2nd page:
Just an update, here's a response I got straight from Activision asking them which portals were compatible with which systems:
Hello, Thank you for contacting Activision Customer Support. Yes but they are not all compatible. The Xbox portal will only work on an Xbox. The 3DS portal is universal and will work on any system except an Xbox. The PS3 and Wii have the same portal and will be interchangeable and can also work in the PC version of the game. The PC portal will only work on the PC version of the game. All portals will work for the Web world. Please feel free to contact us again for technical issues or questions Have a Happy Holidays!
So according to them, there are NO portals, including the 3DS one, that will work on an xbox, aside from the xb360 portal itself. I might just bundle up everything & see if I can swap the wii version for the xb360 one somewhere.
Why not just ask your friend if you can use his/her Wii portal, and let him/her use your 360 portal for their computer? That way, you can both still play the game of whichever system you're going for at the moment.
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