Let's Play Every Game Boy Color Game, Part 44
Mobile Golf (Camelot Software Planning/Nintendo, 2001)
The GBC had a network adapter called the "Mobile Adapter GB" in Japan that allowed it to physically connect to a phone and use the data network to have a very primitive online mode. Mobile Golf was one of only a few games to take advantage of that, but it's also effectively a Mario Golf sequel by the same devs. Both of these things are enough to get it a list spot.
Momotarou Densetsu 1+2 (TamTam/Hudson, 2001)
A retelling of the Momotaro legend in an RPG that's heavily inspired by the early Dragon Quest games. It has some great music and good looking cutscenes, but the battle system is so tedious that I don't have any interest in coming back to it. Never make a battle that's just swapping "attack" back and forth until someone dies, devs.
Monkey Puncher (Atelier Double/Taito, 2000)
Alright, I had high expectations for a game called Monkey Puncher, because how could I not? But my expectations were no match for this game. Whichever character you pick is forced to become a monkey trainer after their sibling and father are kidnapped by Saru, who have taken control of the Monkey Punching Association, which the game is at pains to point out is illegal. Since Saru are gangsters, the only way you can get your family back is to become a Monkey Puncher, which you're able to do because your dad's friend Fred immediately shows up with a monkey for you to train. You name this monkey Freddy. All of this is too amazing to keep to myself, so I stopped playing there and it is going on the list.
Monopoly (Sculptured Software/Majesco, 1999)
Friends don't let friends play Monopoly.
Monster Race 2 (Koei, 1999)
I think this is a Pokemon knockoff where you also race your monsters, but I couldn't tell because it was taking forever to get to real gameplay and I had to stop in the interest of time. Also, the NPC I was supposed to be talking to ran away and I couldn't find him again.
Monster Rancher Battle Card GB (Graphic Research/Tecmo, 1999)
I love the idea of a Pokemon-style game with the full RPG overworld as a card battler, but the translation here is sorely lacking and it's generally not very clear what's going on. It also leaves a lot to be desired in terms of graphics and UI.
Monster Rancher Explorer (Graphic Research/Tecmo, 2000)
This was just called Solomon in Japan, which is much more accurate since it has nothing to do with Monster Rancher. It's a tower of puzzle-platforming challenges that also includes a stage editor. Could be fun for someone interested in this very specific subgenre, but that's not me.
Monster Traveler (Taito, 2002)
A very shameless Pokemon knockoff with much better animation and much worse music. The monster designs are kind of boring, but the space setting is kind of cool. It's a lot of tradeoffs like that. I don't think I'm going to come back to it, but it's not the worst of these I've seen.
Montezuma's Return! (Tarantula Studios/Take 2, 1998)
Another entry in the "sidescrolling platforming with lots of ladders" genre. There's nothing very interesting or unique about this game other than that there's a big line of identical dudes waiting to go into the ruins whenever you die.
Moomin's Tale (Pixel/Sunsoft, 2000)
Apparently the Moomins were getting games as early as 2000. This one actually isn't bad, and it's a fairly original idea. You need to collect all the question mark bubbles in each small level, and you do that by platforming on to whatever hazards are in the area and then bouncing off of them until you reach the targets.
The list:
Golf Ou: The King of Golf
John Romero's Daikatana
Kakurenbou Battle Monster Tactics
Keitai Denju Telefang
The Legend of Zelda: Link's Awakening DX
The Legend of Zelda: Oracle of Ages
The Legend of Zelda: Oracle of Seasons
LEGO Island 2: The Brickster's Revenge
Magi Nation
Mario Golf
Mario Tennis
Metal Gear Solid
Metamode
Millennium Winter Sports
Mobile Golf
Monkey Puncher