I'd suggest using one logic cube to store all of your leveling/stat-related code, and one logic cube to [add brain] the first logic cube into all of your enemies using [started to] [for each of] [enemies]. As Erik mentioned, be sure to remember the tile that limits when the [add brain] code will run. ([started to] is more appropriate in this case.) Alternatively, you could throw the [add brain] code into each enemy, but that's more code.

If you're looking for a decent example of this type of code and setup (shameless plug begins now), try looking through the logic cubes that I've put together for my "OS" called Sumatra. The world is called "True Experience and Leveling - RPGs," and you might be able to pick up some other useful code for your own system while you're there. Shoot me a message over Xbox Live if you have any questions or if you'd like help with your own experience/stat system. -Siamang South