Scandinavia in general, coffee stain consistently release, publish and offer continuous support for amazing games made by Scandinavians (drg, satisfactory)
They own mobile games too:
Supercell (clash of clans & royale, hay day, brawl stars) is Finnish
SYBO Games (Subway Surfers) is Danish
Rovio Entertainment (Angry Birds) is Finnish
King (Candy Crush & more) is Swedish
and RobTop (Geometry dash is Swedish too
The only place to rival them in classic mobile games is Australia which has
Halfbrick (Fruit Ninja, Jetpack Joyride)
and Hipster Whale (Crossy Road)
Oh and the Nordics are just as successful in mobile gaming with critically acclaimed mobile games:
Playdead (Inside and Limbo) are Danish
and Frogmind (Badland) is Finnish
I didn’t count it as a mobile game since it’s a port of a pc game, but then again I first played Minecraft on pocket edition so it is definitely an influential mobile game too!