Was it important part of the game that the store looks just like IKEA?
If yes, that probably makes it more likely that it was a trademark infringement and that IKEA was justified.
If no, it shouldn't be a big deal to change the colors, just to avoid potential confusion.
Comments
My (very) naive take:
Was it important part of the game that the store looks just like IKEA?
If yes, that probably makes it more likely that it was a trademark infringement and that IKEA was justified. If no, it shouldn't be a big deal to change the colors, just to avoid potential confusion.