On most MSX computers, slot 1 and 2 are free for insertion of cartridges, so these slot numbers will be used here as well:

Slot 1	Slot 2	Explanation of combination
Yie Ar Kung-Fu 2	Yie Ar Kung-Fu	Lee Young can throw his descendant a cup of tea when his vitality is too low
Nemesis	Twin Bee	Vic Viper will turn into Twin Bee and the powerups will turn into bells
Vampire Killer	Game Master	Some Game Master options will be activated
Hinotori	Game Master	Some Game Master options will be activated
Hinotori	King Kong 2	King Kong 2 will start providing two extra options. <F4> key will allow you to save the situation, <F5> will load a previously saved situation. It will be saved to tape and they can are entered without pausing
Hinotori	Q*Bert	Some Game Master options will be activated
Ganbare Goemon	Game Master	Some Game Master options will be activated
Ganbare Goemon	Q*Bert	Some Game Master options will be activated
The Maze of Galious	Game Master	No extra options
The Maze of Galious	Knight Mare	Popolon & Aphrodite can be revived upto 99 times in stead of just once
The Maze of Galious	Q*Bert	You start with full vitality, 100 ammo, 100 coins and 100 keys
Nemesis 2	Game Master	No extra options. Strange enough the hi-score won't count with the current score when it exceeded the previous hi-score
Nemesis 2	Penguin Adventure	Metalion will turn into Penguin, powerups will turn into fish and blue powerups will turn into birds
Nemesis 2	Q*Bert	Some passwords will be activated: NEMESIS METALION LARS18TH enters the next stage will activate a green shield will give all weapons These passwords can be entered in pause mode and are to end with RETURN
Nemesis 2	The Maze of Galious	When losing a ship, the option is activated to restore the last active weapons. When the game is over, this option will not be activated after a continue
F-1 Spirit	Game Master	All circuits are accessible
F-1 Spirit	King Kong 2	All circuits are accessible
F-1 Spirit	Q*Bert	All circuits are accessible
The Treasure of Usas	The Maze of Galious	When starting the game, 100 coins are received
The Treasure of Usas	Metal Gear	Halves vitality damage
The Treasure of Usas	Nemesis 2	When the game is over, continuing with <F5> is possible
The Treasure of Usas	F-1 Spirit	In any mood, the secret powers of the happy mood are active
Shalom	Game Master 2	Enables use of S-RAM to save and load the game situation
Break Shot	Game Master 2	Enables use of S-RAM (as read in the Game Master 2 manual)
Pennant Race	Game Master 2	Enables use of S-RAM to save and load the game league and team data
Salamander	Game Master	No extra options
Salamander	Nemesis 2	After obtaining the Crystal Breeze on one of the Latis planets, the hidden Operation 3+ will appear which is the final stage of Nemesis 2 revisited.
Parodius	Game Master 2	Enables use of S-RAM to save and load the game status. Press <S> in pause mode to save, press <L> to load a previously saved game
King's Valley 2	Game Master	Prevents the second installation of the disk ROM
King's Valley 2	Game Master 2	Enables use of S-RAM to save and load user made stages
El Giza's Seal	Game Master 2	Enables use of S-RAM to save and load user made stages
Contra	Game Master 2	Enables use of S-RAM to save and load the game situation. Press <S> in pause mode to save, press <L> to load a previously saved game
Nemesis 3	Game Master 2	Enables use of S-RAM to save and load the game situation. Press <S> in pause mode to save, press <L> to load a previously saved game
Hai No Majutsushi	Game Master 2	Enables use of S-RAM to save and load the game situation
Pennant Race 2	Game Master 2	Enables use of S-RAM to save and load the game league and team data
Solid Snake	Game Master 2	Enables use of S-RAM to save and load the game situation. Press <F5> to save or load a previously saved game

As you may have noticed, some games are testing on a Game Master without doing anything extra with it. I think this test is added to prevent a possible third game. Yie Ar Kung-Fu 2 and Nemesis don't have this test, so this enables saving the screen with the extra option to disk or something. The Treasure of Usas doesn't work with the Game Master so it isn't necessary for Usas to test on the Game Master.