The last revision in 1994 sets the code limit to 100, and has a selection of cheat codes built-in to the cartridge, negating the need to input them every time. It is also able to trick the game into thinking it is running on a specific region of Mega Drive console, thus acting as a fully-fledged region converter (though only for those with PAL consoles, as the device was only sold in Europe).
I didn't encounter one of those problems... When I input the no water code, I find out that the Seasparrow that spawns north of Verdant Meadows ends up on dry land rather than the ordinary water (which means that the water no longer exists, still the water outside the map exists, also go to Easter Basin while this code is active... Both the aircraft carrier and the I/E ship's hovering!)... I can still move, also I operated many codes, and they work fine (on both SA and LCS)... The only problem is that I can't operate "End of the Line" using the replay codes, as it always crashes at the opening Rockstar logos, also that I try to spawn an RC Cam (an extra-ordinary flowerpot that you can ride as a car, go to Glenster's Guide if you want to know more about that), but I end up spawning both the RC Cam and Levithian, I open the Levithian, fine. But when I open the RC Cam, it freezes... You might want to go to this link in order to know which code I mean... 2b1af7f3a8