Four releases today!
I found a Prototype of Missile Defense 3-D for the Master System. Among noticeable changes, this version uses a different music track on the title screen, which isn't part of the final version (incoming VGM pack update!)
As the game uses both Light Phaser and 3-D Glasses you'll need to enable them in your emulator of choice. Meka has menu options for it, you may also download and update your copy of the meka.nam database file if you want those settings to be applied automatically.
Also obtained a Prototype of Bubble Bobble for the Game Gear. Adapted from the Master System version (which itself was an extension of the Arcade game, and an unusually polished and improved port hence the "Final Bubble Bobble" title used in Japan). This prototype seems to exhibit a few differences: the menu flow is not the same as final build (see screenshots), the prototype starts you with 2 lives and infinite continues instead of 5 lives and 5 continues, missing Trademark mark on title screen and some difference in texts. They are probably more gameplay difference to be investigated further.Thanks Paul W!
This cartridge was was apparently a sample cart sent to EGM for review in 1994. According to the auction, "The review of this game can be seen in Electronic Gaming Monthly #63 October 1994, pages 42 and 226 (see pics 11 and 12)".
We also have the dump of USA version of Kawasaki Superbike Challenge for the Game Gear, which curiously was released until now (only the European dump was released and both cartridges are different).
Finally, we have a Correct dump of Sports Illustrated: Championship Football & Baseball for the Game Gear. The dump previously available on the internet (not an SmsPower dump) has 16 incorrect bytes following a pattern that suggest a hardware/software error interfered at the time of the original dumping. They likely didn't affect gameplay much, but they are now fixed. Thanks omonim2007 for the nudge regarding this long awaited dump (I actually made a mistake in my listing and had flagged it as "already dumped", omonim2007 noticed that!).
Finally I would like to thank everyone who has been helping me obtaining and purchasing cartridges and rare games. Most recently, Niloct, yaz0r, Joseph have been very helpful with obtaining things in variety of countries. Thank you.