Shogi 2 and Shogi 3 (Pony Canyon, 1999/2002)
If these look like screenshots of the same game, it's because they might as well be. Despite coming out three years later, Shogi 3 reuses basically all the assets from its prequel and has fewer menu options. As much as this reeks of a company about to go bankrupt, they're still around today.
Shrek: Fairy Tail Freakdown (Prolific/TDK Mediactive, 2001)
This is ostensibly a fighting game, but since there's no flinching or knockback from attacks, it's really just running up to each other and finding out which character has higher DPS. Unbelievably bad.
The Shutokou Racing (Opera House/Pony Canyon, 1998)
A highway racing game where you die if you touch basically anything. It reminds me a bit of Spy Hunter and it's kind of fun. Not something I'm ever going to come back to, but you could've done a lot worse with GBC arcade-style games in 1998.
The Simpsons: Night of the Living Treehouse of Horror (Software Creations/THQ, 2001)
Side scrolling platformer vaguely based on the "Treehouse of Horror" episodes. That's a fine idea, but it's difficult to express how bad this looks and sounds in motion. It received decent (7-8/10) reviews in its day, which I can't understand at all.
The Smurfs' Nightmare (Bit Managers/Infogrames, 1999)
Side scrolling platformer with an overworld that's closer to adventure game-style puzzles. It's actually not bad, as far as these games go. Your Smurf controls well and there's a decent amount of variety in the level design.
Snoopy Tennis (Mermaid Studios/Infogrames, 2001)
Another game that sounds like a disaster, and another one that's actually fine. It's at least much faster paced than the last tennis game that came up, but I am not a fan of it moving you to the far side of the court when you're not serving. It's already hard to tell where the ball is with GBC graphics, and the shift in perspective does not make it any easier.
Snowboard Champion (Dream Japan/Bottom Up, 2000)
I love how this game looks, but the controls are a mess. The slalom minigame you're seeing here lets you swerve back and forth so freely that they had to put random ice hazards in to make it at all challenging, but the other minigames require you to do tricks, and I can't figure out which button does that. Spinning the dpad and alternating A and B did absolutely nothing. There might be specific combinations you have to input, but that isn't explained anywhere in game.
Snow White and the Seven Dwarves (Planet Interactive/Ubisoft, 2001)
A boring licensed platformer that is occasionally interrupted by boring puzzle sequences. The character sprites look great in isolation, but they're so detailed that they can be hard to make out against busy backgrounds at times.
Soccer Manager (Broadsword Interactive/Acclaim Entertainment, 2000)
Acclaim decided to get in on the soccer management genre, and they surpassed a lot of the text-heavy ones I've looked at so far by including a visualization of where the ball is at any point and having real player and team names. Unfortunately, after spending all their money on that, they don't appear to have been able to include any sound. The whole game is silent. That's... not great.
Sokoban Densetsu: Hikari to Yami no Kuni (J-Wing, 1999)
I accidentally skipped the story intro, so other than "it's sokoban!" I don't know when I'm pushing these men on to pentagrams. The title means "Sokoban Legend: The Land of Light and Dark", so presumably I'm on the "of Dark" part, but it still seems a little sketchy. Might be worthwhile if you like sokoban.
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
Metal Gear Solid
Millennium Winter Sports
Pokemon Crystal Version
Pokemon Card GB2 - GR Dan Sanjou!
Pokemon Puzzle Challenge
Pokemon Trading Card Game
Quest for Camelot
Return of the Ninja
Scooby Doo! Classic Creep Capers
SD Hiryuu no Ken EX
Shin Megami Tensei Devil Children: Aka no Shou