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Sanrio Carnival is a Famicom and Game Boy puzzle game starring characters from the Sanrio line of merchandise.
Sanrio Carnival is one of those block drop games that are a lot like Columns, where you drop 1x2 blocks that are combos of 6 possible squares. Line up 3 in a row of any one block, and they vanish. However, it is interesting because it has some quest stages where you need to go for specific combinations or even 4 or 5 in a row. There are chains(1 combo before another) and x- folds(several combos at once.)
The NES version has several advantages over the GB version. First, the play field is 7x12 and not 6x8, leaving more room for silly errors. Second, the piece you rotate around is highlighted, letting you concentrate even more on the board below. Third, the controls don't stink, so you can push the piece where you want it more easily. Finally, there are a few more levels, challenges and ideas. There's also a stats meter saying how many of what piece dropped, but that is not a functional improvement.
Unfortunately, Sanrio Carnival NES accounts for this relative ease by just making the combo quests too long, even at the later levels when pieces seem to fall immediately. Unless you know good cheats. Then anyone with an ounce of heart feels lousy cheating in a game with Hello Kitty regardless of how unfair or tedious it is.