Here is a list which is not complete, if you see one missing please comment and I will add it! Be sure to leave a like favourite it or comment to show you appreciation.
Airplane / Casual
Airplane / Simulation
Aliens / Action
Alternate History / RPG
Business / Simulation
City / Simulation
City / Strategy
Comedy / Casual
Cyberpunk / Action
Cyberpunk / RPG
Dance / Casual
Dance / Simulation
Detective / Adventure
Dungeon / Action
Dungeon / RPG
Dungeon / Strategy
Evolution / Simulation
Fantasy / Action
Fantasy / Adventure
Fantasy / RPG
Fanstasy / Strategy
Fashion / Casual
Fashion / Simulation
Game Dev / Simulation
Government / Simulation
Government / Strategy
Hacking / Simulation
Hacking / Strategy / Mature
History / Strategy
Horror / Action
Hospital / Simulation
Hunting / Action
Law / Adventure
Law / Simulation
Life / Adventure
Life / Simulation
Martial Arts / Action
Medieval / Action
Medieval / RPG
Medieval / Strategy
Military / Action
Military / Simulation
Military / Strategy
Movies / Casual
Movies / Simulation
Music / Casual
Music / Simulation
Mystery / Adventure
Ninja / Action
Pirate / Adventure
Post Apocalyptic / Action / Mature
Post Apocalyptic / RPG / Mature
Prison / Action
Prison / Adventure
Racing / Casual
Racing / Simulation
Rhythm / Casual
Rhythm / Simulation
Romance / Adventure
School / Adventure
School / Simulation
Sci-Fi / Action
Sci-Fi / Adventure
Sci-Fi / RPG
Sci-Fi / Simulation
Sci-Fi / Strategy
Space / Action
Space / Simulation
Space / Strategy
Sports / Action
Sports / Casual
Sports / Simulation
Spy / Action
Spy / Adventure
Startups / Simulation
Superheroes / Action
Surgery / Simulation
Time Travel / Adventure
Transport / Simulation
Transport / Strategy
UFO / Action
UFO / Strategy
Vampire / Action
Vampire / RPG
Virtual Pet / Casual
Virtual Pet / Simulation
Vocabulary / Casual
Werewolf / Action
Werewolf / RPG
Wild West / RPG
Virtual Pet/Casual
Zombies/Action
I have added some of the new topics to this with their combos, but I do not know enough please tell me all the ones you know.