The Alex Kidd that is native to the system, as in when you boot the Sega without a cartridge in it. I'm pretty sure we had pretty much all of them. Castlevania for gameboy was a nightmare. The controls were unresponsive as hell. I do remember always fooling around with the password system, and at several times finding the password to the last boss on a fluke. The music was great though. All these games belonged to my older brother though. The first games that were truly mine, was for the Amiga which I inherited from an older cousin. Had loads of games for it, like cannon fodder, final fight, and many other classics I can't remember the names of. Hated how you had to change floppy disks pretty much whenever there was loading to be done, but it was neat how it had ports for mouse, joysticks, and that it was even compatible with my Sega controllers. Had tons of fun with it.