A bug in the North American version makes levels 31-100 unplayable since there is no boss to fight in level 30.Codemasters has responded with:
” We have been looking very hard into this issue with Nintendo and have now determined that all of the cartridges that have been shipped in North America are faulty.
Needless to say we are extremely sorry that this situation has arisen and would like to apologise to you for this issue.
We have already started the process whereby a corrected version is to be manufactured and will ensure that all customers have their copies replaced. Unfortunately this will take 8–10 weeks (simply because of the time required to manufacture new cards). We will update you with what you will need to do to get a replacement game, as soon as this has been determined.”
Source: Wikipedia, "Bubble Bobble Revolution", available under the CC-BY-SA License.