The higher you get, the harder it is to make progress. Also, it will slow down. In about a month, J2O will probably have stalled somewhere on the list, not too much higher up. Even if it is rising, it would still be a good idea to add Jazz Jackrabbit to the META keywords, just because some people might search for Jazz Jackrabbit without the 2. People who are more farmiliar with Jazz are more likely to use Jazz 2 as a search term, while people who are new to the game, who we want to get to the page, would likely either search for Jazz Jackrabbit or Jazz Jackrabbit 2. Just a thought.